THE RECOVERY FROM DEPRESSION 467 



are not due to the injury, the most prominent secondary factor, 

 for mechanical stimuU are known never to produce depression, 

 but only its opposite, excitation. There were nine experiments 

 on dogs, followed from 2 to 27 days. At the latter time recovery, 

 in such cells as may recover, namely, not completely isolated by 

 the section, is for th-e most part well advanced. In isolated 

 cells, death appears to take place before direct or collateral con- 

 nections are reestablished. 



Microscopic technic 



The fresh material was fixed in saturated corrosive sublimate 

 plus 2 per cent formaldehyde, in alcohol, in formalin, and in 

 vom Rath's fluid. Sections were stained by erythrosin-toluidin 

 blue after mercury and alcohol. Grenadier's borax-carmine and 

 iron hematoxylin after mercury, neutral red (Johnston, '16) after 

 alcohol and formalin, and Delafield's hematoxylin and eosin 

 after vom Rath. 



THE RECOVERY WITHOUT OR WITH TEMPORARY 

 DISORGANIZATION 



Just as functional activity is the quantitative opposite of de- 

 pression, so the process of recovery from depression is one of con- 

 trast to the process of recover}^ from activity. Without reference 

 to its contrasted state, no interpretation as a process could be 

 made, and certain changes indeed would probably appear mean- 

 ingless or not worthy of regard. The morphological contrast 

 between activity and depression may first be summarized. It 

 must be remembered that on account of the initial shifts of size 

 and chromatin in activity, this is not an inclusive comparison. 



Functional activity Functional Depression 



Cytoplasm 



Size: Progressive increase of volume Absoluteh^ smaller stage for stage. 

 Structure: Edematous Compact, granular: albuminous and 



glycogen deposit. 

 Chromatic content : Dechromatiza- Dechromatization of any stage, rest- 

 tion onl3^ as end result. ing as well as active. 



