Treatise on human physiology : For the use of students & practitioners of medicine / By Henry C. Chapman. Illustrated with 595 engravings.

  • Henry Cadwalader Chapman
Date:
1899
Catalogue details

Licence: Public Domain Mark

Credit: Treatise on human physiology : For the use of students & practitioners of medicine / By Henry C. Chapman. Illustrated with 595 engravings. Source: Wellcome Collection.

Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.

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    like the blood corpuscles, which have neither nucleus nor cell wall; Further, there are protoplasmic beings, like the monera, of which the protamoeba (Fig. 1) is an example which, through life, never exhibit either nucleus or cell wall. Such facts prove that in certain cases at least, neither the nu- cleus nor cell wall is an indis- pensable element to the life of cells, and should make physi- ologists cautious in attributing ])Ositive functions to this or that element of a cell. In- deed, it cannot be said that the Protamaba. (H.eckel.) Fig. 2. relative significance of either nucleus, nucleolus, cell wall, or cell centents, is as yet defi- nitely understood. As ex- amples of cells, attention may be called to those lining the uriniferous tubules of the kid- ney, to the cells of the enamel, to those of the epithelium of the mouth (Fig. 2), of the columnar epithelium of the intestine, to the multipolar cell found in nervous tissues, to the ciliated epithelial cells from the pulmonarv mucous Buccal and glandular epithelium, with granular , /T-i. -v\ '' 11 1 matter and oil-globules; deposited as sediment from membrane (1^ Ig. ■)), to blood human saliva. (Dalton.) Fig. .S. Fig. 4. Columnar ciliated epithelium cells from the human nasal membrane: magnified 300 diameters. (Quain and .Shakpky.) cells (Fig. 4), to unstriated muscular fiber cells. As we take up the differ- ent organs, the cells com- posing their tissues will l)e described more in detail ; Human blood-globules, a. Eed globules, seen flat- wise, h. Red globules, seen edgewise, c. Whit© globule. (Dalton.)