PLATE VI. 



Flii. 25. Oil preparation of human blood, as observed on the warm stage. A colourless blood corpuscle is 

 \viiijj the changes of form it has undergone in twenty minutes, p. 9. (Hartnack : Ocul., 3; Obj., a) 



Fir,. 7. Various forms of epithelial cells from the trachea of a cat, after maceration in solution of bichromate 

 at potMfa (;,.!,], t Mill m lean at the top of the figure, to the left. p. 23. (Oc., 4, Obj., 8.) 



