SYSTEMATIC SYNTHESIS OF TISSUES. 



substances different from those the parent-cells 

 selves could secrete. 

 FIG. 117. 



169 

 them- 



FIG. 118. 



FIG. 119. 



Fig. 117 represents a portion of the fluid chyle, in which are exhibited 

 minute granules and larger globules, some of them appearing like, and 

 doubtless being, cells. 



Fig. 118, the same, after the addition of acetic acid. 



Fig. 119 represents,/, the developing blood-cells of a Fish (Haddock) ; 

 r, those of a Reptile (Frog) ; b, those of a Bird (Turkey). 



Fig. 120, the same as the previous, after the addition of acetic acid. 



Fig. 121, cells from spleen. In some the nucleus is seen dividing, in 

 others it is divided, and again subdivided. The process is still better 

 seen in 



Fig. 122, representing the white blood-cells undergoing changes, and 

 their nuclei getting ready to form new cells. Still further representations 

 of cells are given on the next pages. 



110. IT is NOT KNOWN upon what modification the 

 power of secreting the different contents of different 

 cells depends ; their walls seem to be alike, but are dif- 

 ferent in different cases. 



Describe Fig. 117. Fig. 118. 

 110. What ? 



8 



Fig. 119. Fig. 120. Fig. 121. Fig. 122. 



