1901] MICROSCOPICAL JOURNAL 239 
B. The rapidity of diffusion increases, within certain 
limits, with an elevation of temperature (Graham). The 
movements of the protoplasm increase in rapidity be- 
tween 10 and 22 degrees, becoming slower beyond those 
limits, and stopping betweeen 45 and 48 degrees. 
I have seen that at a suitably high temperature these 
currents present themselves even in very viscous liquids. 
It is evident that oxygen as well as the liberation of heat 
attendant on respiration are equally necessary to every 
being. 
C. The paralysis of artificial currents ceases completely 
with an addition of peptone or a new quantity of salts. 
D. This is an evident principle. It is enough to re- 
member the facts concerning the circulation of sap and 
blood. The paralysis of internal currents stops life every 
where, decomposition coinciding with an absolute dimi- 
nution of movement. 
The rapidity of the course of blood through the capil- 
laries is identical with that of the currents of protoplasm 
and varies likewise according to conditions, its result be- 
ing the same—nutrition and life, 
A motionless peripheral layer of serum is observed 
similar to that apparent in the currents of pseudopodia. 
The difference between latent and oscillating life lies, 
in short, in the almost absolute or simply partial inhibi- 
tion of the internal currents. Water, heat, and oxygen 
are required as in a physico-chemical phenomenon, and I 
have often suspended the currents in my protoplasm by 
means of desiccation or refrigération for months to- 
gether. There is then another argument against my 
theory which regarded movements as a result of the dis- 
charges of carbon dioxide—a theory which has certainly 
been for me a source of fertile suggestion, though I have 
now given it up. 
The importance of a large quantity of water in internal 
currents is perfectly demonstrated. I have shown that 
