LARGE AND SMALL ANIMAL CELLS. 



49 



bourhood are lying several smaller ova, which show the 

 gradual progress of their growth. 



FIG. 10. 



FIG. 11. 

 A 



As a contrast to these gigantic cells, I place before 

 you an object from the bed-side ; cells from 

 fresh catarrhal sputa. You see cells in com- 

 parison very small, which with a higher power, 

 prove to be of a perfectly globular shape, and, 

 in which, after the addition of water and re- 

 agents, a membrane, nuclei, and, when fresh, 

 cloudy contents can clearly be distinguished. Most of 



Fig. 10. Young ova from the ovary of a frog. A. A very young ovum. B. 

 A larger one. C. A still larger one, with commencing secretion of brown granules 

 at one pole (e), and shrunken condition of the vitelline membrane from the imbi- 

 bition of water, a. Membrane of the follicle, b. Vitelline membrane, c. Mem- 

 brane of the nucleus, d. Nucleolus. 8. Ovary. 1 50 diameters. 



Fig. 11. Cells from from fresh catarrhal sputa. A. Pus-corpuscles, a. Quite 

 fresh, b. When treated with acetic acid. Within the membrane the contents 

 have cleared up, and three little nuclei are seen. JB. Mucus-corpuscles, a. A sim- 

 ple one. b. Containing pigment granules. 300 diameters. 



4 



