Views of the microscopic world : designed for general reading, and as a hand-book for classes in natural science / by John Brocklesby.

  • Brocklesby, John, 1811-1889.
Date:
1851
Catalogue details

Licence: Public Domain Mark

Credit: Views of the microscopic world : designed for general reading, and as a hand-book for classes in natural science / by John Brocklesby. Source: Wellcome Collection.

Provider: This material has been provided by the Francis A. Countway Library of Medicine, through the Medical Heritage Library. The original may be consulted at the Francis A. Countway Library of Medicine, Harvard Medical School.

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    globules appear in immense numbers, and in the minute ramifications of the ves- sels, are seen rolling along in single rows, with here and there a white globule scattered among them, not more than half as large as the red oval disks. The velocity of the blood is not uniform ; for the current is observed to be subject to sudden momentary checks, after which it again flows on with its for- mer speed. In figure 240, is delineated a portion of the web of a frog's foot, Fig. 240. magnified three hundred and fifty diameters. The web has the appearance of mosaic work, being divided into beautiful hexagonal figures with a nucleus in the centre of each. The most minute ramifications of the blood-vessels are here seen standing prominently forth, and within them the blood globules are clearly revealed—the large oval disks representing the red atoms, and the small round ones the colorless particles. An idea may be gained of the size of the capilla- ries by recollecting the length of the red globules in the blood of the frog. Pollen.—The pollen of flowers which appears as a fine dust to the unas- sisted eye, is shown by the microscope to be an assemblage of organized bodies, possessing regular figures, and varying in size, form, and color, according as they are taken from diflferent plants. The color of the pollen is usually yel-