In Roman mythology, Pluto was the god of the dead. Cerberus was his dog who guard the underworld.

Pluto and Cerberus

In Roman mythology, Pluto was the god of the dead. Cerberus was his dog who guard the underworld.

"The town clock of Athens in the Hellenistic Age." -Breasted, 1914

Athenian Town Clock

"The town clock of Athens in the Hellenistic Age." -Breasted, 1914

"Restoration of the Roman fortified wall on the German frontier." -Breasted, 1914

Fortified Wall

"Restoration of the Roman fortified wall on the German frontier." -Breasted, 1914

"Roman amphitheater at Pola, Dalmatia." -Breasted, 1914

Amphitheater

"Roman amphitheater at Pola, Dalmatia." -Breasted, 1914

"Roman temple at Nimes, France." -Breasted, 1914

Temple

"Roman temple at Nimes, France." -Breasted, 1914

"Roman bridge at St. Chamas in Southern France." -Breasted, 1914

Bridge

"Roman bridge at St. Chamas in Southern France." -Breasted, 1914

The Roman Triumphal Arch in Orange, France. The image shows how it originally looked.

Triumphal Arch

The Roman Triumphal Arch in Orange, France. The image shows how it originally looked.

"The vast Flavian amphitheater at Rome now called the Colosseum." -Breasted, 1914

Colosseum

"The vast Flavian amphitheater at Rome now called the Colosseum." -Breasted, 1914

"A street of tombs outside Rome, on the Appian Way." -Breasted, 1914

Appian Way Tombs

"A street of tombs outside Rome, on the Appian Way." -Breasted, 1914

Monuments in Constantinople by Greeks, Romans, and Turks.

Constantinople

Monuments in Constantinople by Greeks, Romans, and Turks.

A Roman mausoleum at St. Remy, France.

Roman Mausoleum

A Roman mausoleum at St. Remy, France.

Frankish warrior from the German invasions of the Roman Empire.

Frankish Warrior

Frankish warrior from the German invasions of the Roman Empire.

The coat of arms of the papacy and Roman Catholic church.

Roman Catholic Coat of Arms

The coat of arms of the papacy and Roman Catholic church.

Santa Maria Maggiore church in Rome built shortly after the time of Constantine.

Santa Maria Maggiore

Santa Maria Maggiore church in Rome built shortly after the time of Constantine.

Lateran Palace in Rome where Roman bishops would stay in the time of Constantine.

Lateran Palace

Lateran Palace in Rome where Roman bishops would stay in the time of Constantine.

The ancient basilica of St. Peter in Rome.

St. Peter's Basilica

The ancient basilica of St. Peter in Rome.

The tomb of the Roman Emperor Hadrian, in Rome.

Hadrian's Tomb

The tomb of the Roman Emperor Hadrian, in Rome.

The tower of Giralda is a mosque in Seville.

Giralda

The tower of Giralda is a mosque in Seville.

The Roman amphitheater in Arles built in the Middle Ages.

Amphitheater

The Roman amphitheater in Arles built in the Middle Ages.

The architecture in Pisa: a cathedral, baptistry, and Leaning Tower.

Pisa

The architecture in Pisa: a cathedral, baptistry, and Leaning Tower.

A fountain in Rome, Italy.

Fountain

A fountain in Rome, Italy.

The clock of Quaker, William Penn.

Penn's Clock

The clock of Quaker, William Penn.

The clock struck one and the mouse ran down.

Hickory Dickory Dock

The clock struck one and the mouse ran down.

The Roman Triumphal Arch in Orange, France. The image is of how the Arch looks now.

Triumphal Arch

The Roman Triumphal Arch in Orange, France. The image is of how the Arch looks now.

Roman States Flag

Roman States Flag

Roman States Flag

Coat of Arms, Roman States

The Great Seal of the Roman States

Coat of Arms, Roman States

Roman States Stamp (4 bajocchi) from 1852

Roman States 4 Bajocchi Stamp, 1852

Roman States Stamp (4 bajocchi) from 1852

Roman States Stamp (1 scudo) from 1852

Roman States 1 Scudo Stamp, 1852

Roman States Stamp (1 scudo) from 1852

Illustration of 12 books labeled with Roman Numerals.

Books With Roman Numerals

Illustration of 12 books labeled with Roman Numerals.

Illustration of cards that can be used for a matching game with Roman numerals, English numerals, and words.

Matching Game With Roman Numerals

Illustration of cards that can be used for a matching game with Roman numerals, English numerals, and…

Illustration of a child washing face at 7:00. It can be used to write mathematics story problems involving telling time and roman numerals.

Telling Time 7:00 Story Problem

Illustration of a child washing face at 7:00. It can be used to write mathematics story problems involving…

Illustration of a child eating breakfast at 8:00. It can be used to write mathematics story problems involving telling time and roman numerals.

Telling Time 8:00 Story Problem

Illustration of a child eating breakfast at 8:00. It can be used to write mathematics story problems…

Illustration of a child going up stairs at 9:00. It can be used to write mathematics story problems involving telling time and roman numerals.

Telling Time 9:00 Story Problem

Illustration of a child going up stairs at 9:00. It can be used to write mathematics story problems…

Illustration of a child reading at school at 10:00. It can be used to write mathematics story problems involving telling time and roman numerals.

Telling Time 10:00 Story Problem

Illustration of a child reading at school at 10:00. It can be used to write mathematics story problems…

Illustration of a child reading at school at 11:00. It can be used to write mathematics story problems involving telling time and roman numerals.

Telling Time 11:00 Story Problem

Illustration of a child reading at school at 11:00. It can be used to write mathematics story problems…

Illustration of a child running at 12:00 noon. It can be used to write mathematics story problems involving telling time and roman numerals.

Telling Time 12:00 Noon Story Problem

Illustration of a child running at 12:00 noon. It can be used to write mathematics story problems involving…

Illustration of a child walking at 1:00. It can be used to write mathematics story problems involving telling time and roman numerals.

Telling Time 1:00 Story Problem

Illustration of a child walking at 1:00. It can be used to write mathematics story problems involving…

Illustration of a child writing roman numerals at 2:00. It can be used to write mathematics story problems involving telling time and roman numerals.

Telling Time 2:00 Story Problem

Illustration of a child writing roman numerals at 2:00. It can be used to write mathematics story problems…

Illustration of a child making a clock face at 3:00. It can be used to write mathematics story problems involving telling time and roman numerals.

Telling Time 3:00 Story Problem

Illustration of a child making a clock face at 3:00. It can be used to write mathematics story problems…

Illustration of a child hugging his mother at 4:00. It can be used to write mathematics story problems involving telling time and roman numerals.

Telling Time 4:00 Story Problem

Illustration of a child hugging his mother at 4:00. It can be used to write mathematics story problems…

Illustration of a child hauling wood at 5:00. It can be used to write mathematics story problems involving telling time and roman numerals.

Telling Time 5:00 Story Problem

Illustration of a child hauling wood at 5:00. It can be used to write mathematics story problems involving…

Illustration of a child running with a pail at 6:00. It can be used to write mathematics story problems involving telling time and roman numerals.

Telling Time 6:00 Story Problem

Illustration of a child running with a pail at 6:00. It can be used to write mathematics story problems…

Illustration of a child playing toy soldiers at 7:00. It can be used to write mathematics story problems involving telling time and roman numerals.

Telling Time 7:00 Story Problem

Illustration of a child playing toy soldiers at 7:00. It can be used to write mathematics story problems…

Illustration of a child yawning at 8:00. It can be used to write mathematics story problems involving telling time and roman numerals.

Telling Time 8:00 Story Problem

Illustration of a child yawning at 8:00. It can be used to write mathematics story problems involving…

Illustration of a child sleeping all night: 9:00pm to 7:00am. It can be used to write mathematics story problems involving telling time and roman numerals.

Telling Time 9:00pm to 7:00am Story Problem

Illustration of a child sleeping all night: 9:00pm to 7:00am. It can be used to write mathematics story…

The image represents the horizontal clock face system. The bottom is the firing line and the numbers of the clock references the position of other objects.

Horizontal Clock Face System

The image represents the horizontal clock face system. The bottom is the firing line and the numbers…

"Roman snail (Helix pomatia). Note shell covering visceral hump; p.ap., pulmonary aperture (including anus and opening of ureter); f., the foot; g.ap., genital aperture; m., mouth; e., eye on long horn; s.h., one of short horns." -Thomson, 1916

Roman Snail

"Roman snail (Helix pomatia). Note shell covering visceral hump; p.ap., pulmonary aperture (including…

"Reproductive organs of Helix pomatia. O.T., Ovotestis; H.D., hermaphrodite duct; A.G., albumen gland; F.D., female side of common duct; M.D., male side of common duct; O., oviduct; R.S., receptaculum seminis; M.G., mucus glands; D.S., dart-sac; V.D., vas deferens; FL., flagellum; P., penis; M., retractor muscle of penis; AP., genital aperture." -Thomson, 1916

Snail Reproductive Organs

"Reproductive organs of Helix pomatia. O.T., Ovotestis; H.D., hermaphrodite duct; A.G., albumen gland;…

"Snail (Helix pomatia) laying its eggs." -Thomson, 1916

Roman Snail Eggs

"Snail (Helix pomatia) laying its eggs." -Thomson, 1916

"Diagram showing some stages in the life history of the Tapeworm (taenia). A, Cysticercus or Bladderworm stage, before the "head" protrudes from the bladder; B, same, later stage; C, Strobila, or chain of proglottides, many being omitted; D, embro, such as fill the uterus of the mature proglottides. It is protected by a shell. b, bladder; ex., excretory canals; g, genital pore; h, head or scolex provided with hooks and suckers (s); u, uterus in a mature posterior proglottis; z, zone of budding or segment formation. The numerals show the approximate number of the segments, reckoning from the front." -Galloway, 1915

Tapeworm

"Diagram showing some stages in the life history of the Tapeworm (taenia). A, Cysticercus or Bladderworm…

A round clock face with dash marks showing no time.

Blank Clock

A round clock face with dash marks showing no time.

A round clock face with numbers showing no time.

Blank Clock

A round clock face with numbers showing no time.

A round clock face with roman numerals showing no time.

Blank Clock

A round clock face with roman numerals showing no time.

Of the Composite family (Compositae), the Roman wormwood (Ambrosia artemisiaefolia).

Roman Wormwood

Of the Composite family (Compositae), the Roman wormwood (Ambrosia artemisiaefolia).

Roman coin struck to commemorate the victory over Pyrrhus and his elephants.

Victory Coin over Pyrrhus

Roman coin struck to commemorate the victory over Pyrrhus and his elephants.

Two Carthaginian coins. Front and back of each.

Carthaginian Coins

Two Carthaginian coins. Front and back of each.

Roman political leader, Julius Caesar.

Julius Caesar

Roman political leader, Julius Caesar.

Four Roman Gladiators with Armor.

Roman Gladiators

Four Roman Gladiators with Armor.

"Comparative time, when noon in Chicago." -Foster, 1921

Comparative Time

"Comparative time, when noon in Chicago." -Foster, 1921

"Comparative time, when noon in Toronto." -Foster, 1921

Comparative Time

"Comparative time, when noon in Toronto." -Foster, 1921