262 THE INCOME OF ENEllGY 



Fat globules will be found in the epithelial 

 cells. 



LYMPH 



Permeability of Vessel Wall in Inflammation. 



1. In a curarized frog whose brain has been 

 destroyed by pithing spread the mesentery over 

 the glass plate of the mesentery board, and ob- 

 serve the capillary circulation under the micro- 

 scope. Note the following changes. Dilatation 

 of the arteries, veins, and capillaries, in the order 

 named. With the dilatation an increase in the 

 speed of the blood-stream, most noticeable in 

 the arteries. After half an hour to an hour the 

 acceleration gives place to slowing. All the 

 vessels are now dilated, many capillaries are 

 plainly visible that could hardly be made out in 

 the normal state, the pulsation in the arteries 

 is uncommonly strong down to their smallest 

 branches, yet the circulation is everywhere slug- 

 gish. In consequence of the slow blood-stream, 

 the capillaries become crowded with corpuscles, 

 so that they appear redder and more volumi- 

 nous than normal, yet their cross-section is only 

 slightly increased. In the veins the normally 

 almost clear plasma next the wall fills gradually 

 with leucocytes. The .white corpuscles pass 

 through the walls of the veins and capillaries. 



