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An illustration of the anteridium of a bracken. An antheridium (plural: antheridia) is a haploid structure or organ producing and containing male gametes (called antherozoids or sperm). Brackens (Pteridium) are a genus of about ten species of large, coarse ferns, in the family Dennstaedtiaceae. The genus has probably the widest distribution of any fern genus in the world, being found on all continents except Antarctica and in all environments except for hot and cold deserts. Therefore it is considered to have a cosmopolitan distribution.

Antheridium of Bracken

An illustration of the anteridium of a bracken. An antheridium (plural: antheridia) is a haploid structure…

"Showing (1) cartilage with martrix and cells; (2) cartilage with matrix containing cells and white fibers." — Blaisedell, 1904

Longitudinal section of cartilage

"Showing (1) cartilage with martrix and cells; (2) cartilage with matrix containing cells and white…

"Diagram showing the principal parts of the cell as it appeaers when killed and stained. The protoplasm shows more of a meshwork (cy), the spaces representing the alveoli. f, formed substance in alveoli." -Galloway, 1915

Cell Parts

"Diagram showing the principal parts of the cell as it appeaers when killed and stained. The protoplasm…

"A colony of Cercomonas termo, a typical flagellate infusorian." -Whitney, 1911

Cercomonad Flagellate

"A colony of Cercomonas termo, a typical flagellate infusorian." -Whitney, 1911

"Epistylis anastatica, magnified, growing in seven zoödendria or dendriform colonies of zoöids, on an entomostracous crustacean. (Two detached individuals on the left are much more highly magnified.)" -Whitney, 1911

Ciliate

"Epistylis anastatica, magnified, growing in seven zoödendria or dendriform colonies of zoöids,…

"Cellular Connective Tissue, showing large vacuoles. v, in the protoplasm." -Galloway, 1915

Connective Tissue

"Cellular Connective Tissue, showing large vacuoles. v, in the protoplasm." -Galloway, 1915

"A, columnar cells of intestine; B, polyhedral cells of the conjuctiva; C, ciliated conical cells of the trachea; D, ciliated cell of frog's mothl E, inverted conical cell of the trachea; F, squamous cell of the cavity of the mouth, seen on its broad surface; G, squamous cell, seen edgeways." — Blaisedell, 1904

Various kinds of epithelial cells

"A, columnar cells of intestine; B, polyhedral cells of the conjuctiva; C, ciliated conical cells of…

"One of the simplest of the tissues in the body is called the <em>epithelium</em>, and its cells are called epithelial cells. It serves as a lining of various cavities, a covering for the surface of the body, and the essential part of various organs called glands." — Blaisedell, 1904

Cross-Section of the Epithelium

"One of the simplest of the tissues in the body is called the epithelium, and its cells are…

"The Right Femur sawed in Two Lengthwise." — Blaisedell, 1904

Cross Section of a Femur

"The Right Femur sawed in Two Lengthwise." — Blaisedell, 1904

"The connective tissue with white fibers sometimes forms a very thin sheet, as in the delicate covering of a bone known as the periosteum, or it may be made up into ropelike bands, as in the ligaments of joints and the tendons of muscles." &mdash; Blaisedell, 1904

White fibrous tissue

"The connective tissue with white fibers sometimes forms a very thin sheet, as in the delicate covering…

Fritillary is a genus of liliaceous plants, characterized by bearing solitary flowers, each with six petals, and a nectary to each petal. This image shows the variety F. meleagris.

Fritillary (F. meleagris)

Fritillary is a genus of liliaceous plants, characterized by bearing solitary flowers, each with six…

Grovia Oviformis is a type of Foraminifera (a class of unicellular animal/protozoa). They are almost always marine in distribution and typically have limy shells.

Grovia Oviformis

Grovia Oviformis is a type of Foraminifera (a class of unicellular animal/protozoa). They are almost…

1. Nerves of the skin 2. Tendons 3. Arteries of the palm of the hand 4. Elbow nerve 5. Elbow artery 6. Nerve of the forearm 7. Nerve of the under-arm 8. Artery of the underarm.

Hand

1. Nerves of the skin 2. Tendons 3. Arteries of the palm of the hand 4. Elbow nerve 5. Elbow artery…

Section through the Head and Neck on the Median Line. 1. Medulla Oblongata 2. Pons 3. Right lobe of cerebrum 4. Cerebellum in section 5. Blood vessel 6. Corpus Striatum 7. Nasal Passage 8. Nasal bone 9. Soft Palate 10. Hard Palate 11. Tongue 12. Epiglottis 13. Os Hyoides 14. Oesaphagus 15. Spinal 16. Larynx 17. Windpipe

Sectional view of the Head

Section through the Head and Neck on the Median Line. 1. Medulla Oblongata 2. Pons 3. Right lobe of…

1. Helix 2. Concha 3. Outer passage 4,5,6. emicircular canals 7. Oval indow 8. Cochlea 9. Eustachian tube 10. Ear drum

Inner Ear

1. Helix 2. Concha 3. Outer passage 4,5,6. emicircular canals 7. Oval indow 8. Cochlea 9. Eustachian…

1. Collar bone 2. Left Lung 3. Breast Bone 4. Right Lung 5. Ribs 6. Right lobe of the liver 7. Left lobe of the liver 8. Cartilage 9. Stomach 10. Spleen 11. Descending colon 12. Transverse colon 13. Ascending colon 14. Omentum 15. Coecum 16. Verniform appendix 17.Mesentery 18. Small intestines 19. Sigmoid Flexure 20. Bladder

Internal Anatomy

1. Collar bone 2. Left Lung 3. Breast Bone 4. Right Lung 5. Ribs 6. Right lobe of the liver 7. Left…

"Little openings (Haversian canals) are seen, and around them are arranged rings of bone with little dark spaces (<em>lacunae</em>), from which branch out fine dark lines (<em>analiculi</em>)." &mdash; Blaisedell, 1904

Cross-section from a shaft of a long bone

"Little openings (Haversian canals) are seen, and around them are arranged rings of bone with little…

"Consisting of a very fine network of fibrils, around which are cells of various sizes." — Blaisedell, 1904

Connective Tissue from a Lymphatic Gland

"Consisting of a very fine network of fibrils, around which are cells of various sizes." — Blaisedell,…

Great naturalist who announced that brachiopods were not to be classed under mollusks but under worms.

Edward Sylvester Morse

Great naturalist who announced that brachiopods were not to be classed under mollusks but under worms.

1. Temporal Artery 2. Artery behind the ear 3. Occipital Artery 4. Greater occipital nerve 5. Smaller ocipital nerve 6. Nerve of the neck 7. Trapezius muscle 8. Clavicular nerve 9. Clavicle 10. Sterno-0cleido-mastoid muscle 11.Outer artery of the head 12. Inner artery of the head 13. Salivary gland 14. Nerves of the lower jaw 15. Outer maxillary artery 16. Nerve of the chin 17. Circular muscle of th emouth 18. Greater yoke muscle 19. Nerves below the eye 20. Masseter or chewing muscle 21. Ear passage 22. Arteries of the forehead 23. Nerves of the forehead 24. Eye closing muscle 25.Facial Artery 26. Facial nerve

Neck

1. Temporal Artery 2. Artery behind the ear 3. Occipital Artery 4. Greater occipital nerve 5. Smaller…

"Cell of Pellionia Daveauana, showing starch-grains. The black, crescent-shaped body on the end of each grain is the amyloplast." -Gager, 1916

Pellionia Plant Cell

"Cell of Pellionia Daveauana, showing starch-grains. The black, crescent-shaped body on the end of each…

An illustration of a young prothallus: sp, spore; pr, prothallus. A prothallium, or prothallus is usually a pteridophyte, i.e. spore-bearing plant, (almost exclusively ferns) in gametophyte stage in the alternation of generations cycle.

Young Prothallus of Fern

An illustration of a young prothallus: sp, spore; pr, prothallus. A prothallium, or prothallus is usually…

An illustration of a microscopic view under the surface of a young prothallus: pr, prothallus; w, root-hairs; an, antheridia; ar, archegonia. A prothallium, or prothallus is usually a pteridophyte, i.e. spore-bearing plant, (almost exclusively ferns) in gametophyte stage in the alternation of generations cycle.

Young Prothallus of Fern

An illustration of a microscopic view under the surface of a young prothallus: pr, prothallus; w, root-hairs;…

"Diagram of a portion of the ovary of Sea-urchin showing the eggs arising from the epithelium (reproductive epithelium) by constriction. e, epithelium; o, ova in different stages of growth." -Galloway, 1915

Sea Urchin Ovary

"Diagram of a portion of the ovary of Sea-urchin showing the eggs arising from the epithelium (reproductive…

1. Frontal bone 2. Parietal bone 3. Coronal Suture 4. Squamous portion of Temporal bone 5. Mastoid process of Temporal bone 6. Zygoma 7. Superior Maxillary Bone 8. Inferior Maxillary Bone 9. Tempero-Maxillary Bone 10. Nasal Bone 11. Orbit 12. Cervical Vertebra 13. First Rib 14. Clavicle 15. Manubrium 16. Body of Sternum 17. Ensiform Process of Sternum 18. Shoulder Blade 19. Acromion Process of Scapula 20. Costal Cartilage 21. Seventh Rib 22. Eighth Rib 23. Twelfth Rib 24. Twelfth Dorsal Vertebra 25. Lumbar Vertebra 26. Head of Humerus 27. Humerus 28. Elbow-Joint 29. Radius 30. Ulna 31. Wrist 32. Metacarpal bone 33.Thumb 34. Phalanges of the Finger 35. Sacrum 36. Ilium 37. Crest of the Ilium 38. Pubic Bone 39. Ischium 40. Sacro-Iliac Symphysis 41. Pubic Symphysis 42. Obturator Foramen 43. Head of Femur 44. Neck of Femur 45. Greater trochanter 46. Femur 47 Patella knee-pan 48. Tibia 49. Fibula 50. External Malleolus 51. Internal Malleolus 52. Os Calcis 53. Tarsus 54. Metatarsal Bone 55. Phalanges of Toes

Skeleton

1. Frontal bone 2. Parietal bone 3. Coronal Suture 4. Squamous portion of Temporal bone 5. Mastoid process…

"There are in all two hundred and six seperate bones in the adult skelton. The teeth are not bones, but are a part of the skin." — Blaisedell, 1904

Human skeleton

"There are in all two hundred and six seperate bones in the adult skelton. The teeth are not bones,…

An illustration of a germinating spore of the common polypody: sp, exospore; k, first root-hair.

Germinating Spore of the Common Polypody

An illustration of a germinating spore of the common polypody: sp, exospore; k, first root-hair.

An illustration of a germinating spore of the common polypody: sp, exospore; k, first root-hair.

Germinating Spore of the Common Polypody

An illustration of a germinating spore of the common polypody: sp, exospore; k, first root-hair.

"A Portion of a Striped Muscular Fiber. Highly magnified. A, fiber separating into disks; B, fibrillae; C, cross-section of a disk." — Blaisedell, 1904

Striped Muscular Fiber

"A Portion of a Striped Muscular Fiber. Highly magnified. A, fiber separating into disks; B, fibrillae;…

"Along with white fibrous tissue, the yellow fibrous tissue... makes the coats of the arteries, and certain ligaments, elastic." &mdash; Blaisedell, 1904

Yellow elastic tissue

"Along with white fibrous tissue, the yellow fibrous tissue... makes the coats of the arteries, and…