Noteworthy anatomical and physiological researches. 
Carbon dioxide and living protoplasm. 
The question as to the influence of CO, on the protoplasm 
has received much investigation but is not accurately deter- 
mined. Giuseppe Lopriore, before giving an account of his 
reinvestigation of the question,! summarizes the previous 
minished growth; while a third group will only develop when 
the cultures are kept warm in the incubator. While CO, # 
ordinary pressure is not fatal to bacteria, at a higher i 
it may be. 
The yeasts behave differently—even oppositely—according 
to the species. According to Brefeld yeast may grow 1" CO, 
which contains as little oxygen as gyyx of its volume, W h, 
may therefore be considered almost pure. According to a e 
on the contrary, CO, exercises a strongly r etarding ine 
upon the power of multiplication of yeast. the 
The relation of CO, to green plants is inferred from : 
experiments upon different vital phenomena which here mi 
best be considered singly. in pure 
As to the germination of seeds, this does not occur If i 
CO,, which appears to kill embryos of swollen seeds. : 
seeds are dry they resist its action as well as in alt. but 
atmosphere containing 50% CO, seeds cannot germinate, ae 
viability is not lost for they do “cerminate upon being i 
ferred to air, Seedlings which can stand this gas gee 
when exposed to sunlight die, on the contrary, in 4? datk- 
phere containing only 8% CO, when they are kepree 
ness. 2 
t Tie : PRE 2 a ite 
PMlansensell, Pring fay, See Oa aan ee 2. AS 
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