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Quarterly journal of microscopical science . ial cells of the lowerwall come into focus in places, and so somewhat complicatethe representation. The stomata are abundantly present, butnone of them equal in size the largest shown in the last photo-graph ; in several places, moreover, black spots, similar to theother stomata in shape and size, may be observed in the cellboundaries. V. Photograph representing the stomata of a vein, 1-lOOOthof an inch in diameter, in the mesentery of the frog. Nega-tive No. 194, New Series. From preparation No. 3276,Microscopical Section. Magnified 400 diameters b

Quarterly journal of microscopical science . ial cells of the lowerwall come into focus in places, and so somewhat complicatethe representation. The stomata are abundantly present, butnone of them equal in size the largest shown in the last photo-graph ; in several places, moreover, black spots, similar to theother stomata in shape and size, may be observed in the cellboundaries. V. Photograph representing the stomata of a vein, 1-lOOOthof an inch in diameter, in the mesentery of the frog. Nega-tive No. 194, New Series. From preparation No. 3276,Microscopical Section. Magnified 400 diameters b Stock Photo
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Contributor:

The Reading Room / Alamy Stock Photo

Image ID:

2AN938W

File size:

7.1 MB (305.4 KB Compressed download)

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Dimensions:

1590 x 1571 px | 26.9 x 26.6 cm | 10.6 x 10.5 inches | 150dpi

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Quarterly journal of microscopical science . ial cells of the lowerwall come into focus in places, and so somewhat complicatethe representation. The stomata are abundantly present, butnone of them equal in size the largest shown in the last photo-graph ; in several places, moreover, black spots, similar to theother stomata in shape and size, may be observed in the cellboundaries. V. Photograph representing the stomata of a vein, 1-lOOOthof an inch in diameter, in the mesentery of the frog. Nega-tive No. 194, New Series. From preparation No. 3276,Microscopical Section. Magnified 400 diameters by Waless-ith objective, illuminated by the Magnesium lamp. Thesmall vein represented comes well into view, while the nucleiof the surrounding tissue are seen out of focus on each side ofit. Several of the stomata present clear centres, while others 387 are black and opaque throughout; they average 1-lOOOOth ofan inch in diameter. VI. Photograph representing a minute artery, with partof the adjoining network of capillaries, from the muscular. coat of the urinary bladder of the frog. Negative No. 220,New Seiies. From preparation No. 3378, Microscojjic Section.Magnified 400 diameters by Waless -^th objective. The fieldis crossed by a small artery, 1-1700th of an inch in diameter.Its ej^ithelial cells are longer in proportion to their widththan those of the veins. They average 1-400th of an inch inlength, and have nuclei similar to those of the venous epithe-lium. Wherever the capillaries come into focus the epitheliumof their walls is also plainly shown. In the intervascularspaces the nuclei of the muscle and connective tissue appearas in the first photograph. The cut presents an outline of apart of the picture; a, a, are the nuclei of the vascular epi-thelium ; b, b, those of the muscle ; c, c, those of the connec-tive tissue. VII. Photograph representing a portion of the view pre-sented by the last picture. Negative No. 22S, New Series.Magnified 1000 diameters by Powell and Lela

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