456 BOTANICAL GAZETTE [JUNE 
merely, to systematize the designations of certain types of physio- 
logical reactions, and to arrange them so as to provide for future 
development. In doing this he has found it necessary to create a _ 
few new terms and to modify the meaning of old terms. The pro- 
posed arrangement of some of the more important groups of soil 
bacteria is as follows: 
if GROUPS OF SOIL BACTERIA ARRANGED IN ACCORDANCE WITH THEIR 
PHYSIOLOGICAL FUNCTIONS : 
Ammono-bacteria De-ammono-bacteria 
amino- ~ -ami 
pepto- -pepto 
proteo- -proteo 
-nitri 
-nitra 
Nitro-bacteria De-nitro-bacteria 
nitri- -nitri 
ik ammono- -ammono 
nitri- -nitrioxy 
-nitraoxy 
Proteo-bacteria De-proteo-bacteria 
ammono- -pepto 
amino- -amino 
pepto- -ammono 
proteo- 
nitri- 
nitra- 
Azoto-bacteria De-azoto-bacterta 
azo- amino-azo 
rhizo- ammono-azo 
nitra-azo 
nitri-azo 
Sulpho-bacteria De-sul pho-bacteria 
sulphid- : -sulphite 
thio- -sulphid 
Ferri-bacteria 
erro- 
DEFINITIONS 
Ammono-bacteria.—Organisms capable of producing ammonia out of 
nitrogen compounds. 
Nitro-bacteria.—Organisms capable of oxidizing nitrogen compounds to 
nitrites, nitrates, or both. 
