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Botany |
Record 76 to 100 of 142 |
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Peas, Germinating "Germinating peas, growing in water, one deprived of its cotyledons." -Bergen, 1896... |
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Peas, Soaked "Soaked Peas in stoppered bottle, ready for exhaustion of air." -Bergen, 1896... |
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Peridia, Cellular structure of "Under the power of about 90 diameters the general character of the peridia is seen. They are densely aggregated, elongated, submerged, pale-brown, irregularly torn. The sporidia are copius...Nos. 1... |
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Photosynthesis "Diagram to show the effect of different portions of the spectrum on photosynthesis. a to F, different regions of the spectrum from red to blue. A filamentous alga lies across these, and bacteria are ... |
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Pit Development "Different stages in the development of a bordered pit. b, The original, thin, primary wall; a, the overhanging border formed as the wall thickened. B, Thickening of the wall has continued and extende... |
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Plant Cell Diagram of a mesophyll cell of a leaf: c, chloroplast; n, nucleus; v, vacuole; w, cell wall.... |
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Plant Cell Division 1 First stage in plant cell division: Protophase 1; "Resting cell ready to begin division." -Stevens, 1916... |
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Plant Cell Division 2 Second stage in plant cell division: Protophase 2; "the nuclear reticulum is assuming the form of a thickened thread, and the cytoplasm at opposite poles is becoming thread-like to form the spindle fi... |
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Plant Cell Division 3 Third stage in plant cell division: Protophase 3; "The nuclear thread has divided longitudinally throughout the middle, and the spindle fibers have become more definite." -Stevens, 1916... |
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Plant Cell Division 4 Fourth stage in plant cell division: Protophase 4; "The nuclear membrane and the nucleolus have disappeared, and the nuclear thread has become segmented into chromosomes which are assembling at the eq... |
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Plant Cell Division 5 Fifth stage in plant cell division: Metaphase; "The metaphase, where the longitudinal halves of the chromosomes are being drawn apart preparatory to their journey toward opposite poles." -Stevens, 191... |
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Plant Cell Division 6 Sixth stage in plant cell division: Anaphase; "The anaphase, or movement of the chromosomes toward the poles, is about completed, connecting fibers extend from pole to pole." -Stevens, 1916... |
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Plant Cell Division 7 Seventh stage in plant cell division: Telophase; "Telophase where the chromosomes have begun to spin out in the form of a nuclear reticulum. The connecting fibers have begun to thicken in the equatori... |
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Plant Cell Division 8 Eighth stage in plant cell division: "The connecting fibers have spread out and come into contact with the wall of the mother cell in the equatorial plane, and the thickening of the fibers throughout ... |
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Plant Cell Division 9 Ninth and final stage in plant cell division: "A nuclear membrane has been formed about each daughter nucleus, and the dividing cell-wall is complete." -Stevens, 1916... |
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Plant Reproduction "Showing method of association of paternal and maternal chromosomes, at A in all vegetative nuclei, and B, C, D, their manner of separation in all vegetative nuclear divisions. Showing also manner of ... |
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Plant Tissues "Diagram to show the topography and character of the tissues that evolved from the primary meristems. Cambial activity has not yet begun." -Stevens, 1916... |
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Plant Tissues "Diagram showing additions to the primary tissues through the activity of the cambium and phellogen or cork cambium." -Stevens, 1916... |
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Plant Tissues "Diagram showing the relation of this year's leaves to the wood of the current year." -Stevens, 1916... |
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Potato diseases at a microscopic level "It is not unusual to fine a decayed spot in the center of potatoes otherwise apparently in good condition. A microscopic examination a portion of the diseased part will show that the decay commenced... |
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Propagation by Cuttings Plant propagation is the process of artificially or naturally distributing plants. Pictured here is the propagation of plants through cutting.... |
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Root Hair, Plant "Apex of root hair flattened out over and imbedding soil particles." -Stevens, 1916... |
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Root Hair, Plant "A single root hair on a large scale, showing that it is an outgrowth of an epidermal cell, and the fact that it possesses a living protoplast and large vacuole filled with cell-sap and traversed by c... |
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Root Hairs, Plant "Cross section of a root in the region of the root hairs." -Stevens, 1916... |
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Root Pressure "Apparatus to measure root-pressure. T, large tube fastened to the stump of the dahlia stem by a rubber tube; rr, rubber stoppers; t, bent tube containing mercury; ll', upper and lower level of mercur... |
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