DETAILED SYNTHESIS. 

 FlG. 133. FIG. 134. 



Fio. 135, 



Figs. 124 and 125 represent highly magnified portions of milk; their 

 granules, globules, and cells, being very apparent. " Fig. 126, Blood-cells 

 differing in appearance according to their position ; there are two white 

 ones. Fig. 127, portion of chyle of dog, showing granules, globules, and 

 cells, some with fibrous appearance. Figs. 128 to 135, differently formed 

 cells, dividing in 132, extending into fibres in 131, uniting to form capilla- 

 ries in 134, or arranged, as in 135, to form an arterial tube. (See p. 171.) 



116. IT is EVIDENT that the amount of substance 

 that can be secreted will depend upon the amount of 

 secretory tissue concerned. 



117. WHEN A LARGE AMOUNT OF SUBSTANCE MUST 

 BE SECEETED, it will be necessary to correspondingly 

 increase the amount of secretory tissue ; and if the space 

 allowable is not sufficient to spread out the membrane, 

 it must be formed into tubes or into cells, by which a 

 greater amount can be packed in a given cubical space. 



118. IF THE CELLULAR FORM RESTING ON AN EX- 

 TENDED SURFACE is NOT SUFFICIENT, as it is in case of 

 the general, cuticular, mucus, and serous surfaces, the 

 amount of secretory tissue in a given space can be in- 

 creased by making the surface on which the cells rest 

 uneven, raising it in ridges or sinking it in grooves, or 

 raising it in papillae or burrowing it into the form of 

 tubes, with branches and pouches on the sides of them, 



Describe Figs. 110, 109, 88, 7T, in respect to cells. 116. What ? 117. What 

 necessary f 118. What? 



