AGRICULTURAL BOTAXY. 29 



nrea, uric acid, glycocoll, and liippuric acid. The results obtained by varying 

 the nutritive solutions are detailed in connection with each experiment. 



Assimilation of nitrites by mold fungi, I, A. Kossowicz (Ztschr. Garungs- 

 physiol., 2 {1912), No. 1, pp. 55-58; abs. m CentU. Bakt. [etc.], 2. Aht., 37 

 (1913), JVo. .'f-6, p. 74). — In experiments made with the mold fungi enumerated 

 in the preceding abstract, all were found able to utilize nitrites as nitrogen 

 sources. From the fact that only two could be induced to use ammonia in this 

 way, the author concludes that these mold fungi take up the nitrite ion directly 

 without previous reduction to ammonia. With otherwise suitable nutritive solu- 

 tions, moderate concentrations of nitrites in solution produced no marked dele- 

 terious effect upon the mold fungi. Dextrose and cane sugar proved to be 

 much better sources of carbon than mannite in these experiments. 



The relation of some mold fung'i to calcium nitrate, I, II, A. Kossowicz 

 (Ztschr. Gdningsphysiol., 1 (1912), No. 2, pp. 124, 125; 2 (1913), No. 3, pp. 

 154-157).— The results of several series of investigations carried out under 

 varied conditions with the 10 fungi enumerated above indicate that a few of 

 these thrive with calcium nitrate in the nutritive medium, while others are 

 unfavorably influenced. It is thought probable, however, that the injurious 

 action shown by that salt is in part due to its impurities, and these would thus 

 become important in connection with its use as a fertilizer. 



The assimilation of guanin and guanidin by mold fungi, I, A. Kossowicz 

 (Ztschr. GurungsphysioJ., 2 (1912), No. 2, pp. 84-86). — Experimenting with 

 the mold fungi above mentioned, the author found that all were able to utilize 

 guanin as nitrogen source, also guanidin (Aspergillus glaucus and Cladosporium 

 herbanim developed slowly, however), and that all flourished with guanin as 

 source of both carbon and nitrogen under conditions favoring the formation of 

 ammonia. A further report on the utilization of guanidin in this last relation 

 is promised. 



Sulphocyanic compounds as source of carbon, nitrogen, and sulphur for 

 mold fungi, I, A. Kossowicz and L. von Gkolleb (Ztschr. Gdrungsphysiol., 2 

 (1912), No. 1, pp. 59-65). — The authors carried out experiments with iron, so- 

 dium, potassium, and ammonia compounds of sulphocyanic acid on the 10 mold 

 fungi named above to ascertain any possible toxic relations and the ability of 

 the fungi to utilize the carbon, nitrogen, and sulphur in the compounds. 



It is stated that all 10 fungi were able to utilize these compounds as sources 

 of nitrogen and sulphur, but not as exclusive sources of carbon or as an exclu- 

 sive common source of carbon and nitrogen. Most of these compounds seem to 

 exert a depressing effect upon the development and fructification of the fimgi. 

 Mannite was found to be inferior to dextrose as a constituent of the nutritive 

 medium. 



Preliminary report on the relations of yeast and mold fungi to sodium 

 thiosulphate, A. Kossowicz and W. Loew (Ztschr. GurungsphysioL, 2 (1912), 

 No. 1, p. 7S; abs. in Centbl. Bakt. [etc.], 2. AM., 37 (1913), No. 4-6, p. 86).— 

 This brief preliminary report of the authors' investigations states that 6 yeasts 

 investigated by them utilized this thiosulphate as a source of sulphur with evo- 

 lution of hydrogen sulphid. Mold fungi also assimilated thiosulphate but other- 

 wise showed different relations thereto. Botrytis hassiana, Cladosporium herba- 

 rum, PenicilUum brevicaule, Aspergillus glarucus, Isaria farinosa, and Fusispo- 

 rium assimilated this compound directly without formation of hydrogen sulphid 

 or of sulphuric acid, without deposit of sulphur, and with no marked oxidation 

 of thiosulphate. Under like conditions Mucor showed evolution of hydrogen 

 sulphid. P. glaucum and A. niger formed polythionates or sulphuric acid and 

 in the latter case deposited free sulphur in the mycelial threads. It is 

 stated that all these mold fmigi showed good development in a medium contain- 



