INORGANIC SALTS TO MONILIA SITOPHILA 291 
stances. He has not taken into account the influence of the 
glucose on the toxicity of the poisons used although in an experi- 
ment in which he studies the action of copper salts in the presence 
of potassium acetate both with and without glucose, he obtains 
: evidence that the glucose lessens the toxicity of the copper. 
1 Although Lipman (17) makes mention of the fact that sodium 
r carbonate is much less toxic to ammonifying organisms in certain 
soils than in pure peptone solutions, he has, nevertheless, drawn 
conclusions as to the toxicity of various salts after testing them 
in a medium consisting of soil and dried blood, without taking 
into account the effect of the organic substances on the salts which 
the soil must have contained. 
My results show that toxicity measurements which are made 
; eee without regard to the organic substances in the medium are of little 
value as indicating the relative resistance of different organisms. 
The bearing of the facts here brought out on a number of practical 
problems is evident. They must be reckoned with in considering 
the influence of the decomposition products of humus in the soil, 
on soil toxins, in the preparation of antidotes, in the chemical 
sterilization of water and in the preservation of milk and other 
food materials by chemical means. 
This work has been done under the direction of Prof. R. A. 
Harper, to whom I am very grateful for many valuable sugges- 
tions. I also wish to thank Prof. W. G. Marquette for helpful 
advice. 
COLUMBIA UNIVERSITY 
New YorK City 
BIBLIOGRAPHY 
1. Arthus, M., & Huber, A. Ferments solubles et ferments figurés. 
Archiv. Physiol. V 4: 651. 1892. 
2. Bessey, E. A. Ueber die Bedingungen der Farbbildung bei 
Fusarium. Flora 93: 301. 1904. 
3. Boehm, J. Ueber den vegetabilischen Nahrwerth der Kalksalze. 
Sitzb. Akad. Wiss. Wein Math.-Nat. 71: 287. 1875. 
4. Clark, J. F. On the toxic effect of deleterious agents on the 
germination and development of certain filamentous fungi. 
Bot. Gaz. 28: 289; 378. 1899. 
