CAXCER-CELLS. 



velopment, and of the various kinds, and cancer-cells, is seen in the 

 four next figures (Figs. 88 to 91). 



Fig. 88. Fig. 89. 



Young epithelial cells filled with few and 

 small granules, w. Cell-wall, x. The nu- 

 cleus, very small in proportion to cell, and 

 containing no nucleolus. (Lebert.) 



Cells from the epidermis, y. Nucleus without nucle- 

 olus, diminutive in proportion to cell. i. The cell, with 

 homogeneous minute granulations filling up the cen- 

 tre. Diameter of the cell, when taken from the skin, 

 l-250th inch. 



Fig. 91. 



Buccal epithelial scales. 11. Irregularly poly- Ciliated epithelium from air-passages. 9. 



gonal contour. 12. The characteristic nucleus Hair-like appendages (cilia), which, during 



without any appearance of a nucleolus ; which is life, are constantly in motion. 10. Nucleus clear 



rarely met with in epidermic cells, or in those com- in the centre, 

 ing from the buccal surface. 



Since crystals of cholesterine, of ammonio-magnesian phosphate, 

 and of margarine, fat-globules, filaments, and pus, may be found 

 mixed with cancer-cells, Dr. Donaldson insists upon the examination 

 of every part of a mass supposed to be cancerous, before deciding 

 that it is not so. "If but one cancer-cell be found, it is conclusive," 

 says Dr. Donaldson; a proposition, however, which should not be 

 practically adopted, as will appear. 



"Out of the body, cancer elements change more rapidly than any 

 others; nor can they be preserved in any fluid;" therefore they 

 should be examined at once. Within the first day they may become 

 degenerated by the appearance of fatty granules, which often hide 

 their distinctive characteristics. 



Epithelial cancer will be spoken of in connection with " Epithe- 

 lium." 



Much discussion has arisen, of late, in regard to the value of the 

 microscope in the diagnosis of cancer ; one party contending that 

 this instrument is totally unreliable in this respect, while the oppo- 



