T IS EXPERIMENT 8TATTOH RECORD, 



fungus i- known uudcr many forme and produces quite a variety .'i pigments \ 

 biological stud) was made of u in order to test the effect of culture media on 1 1 1 » - 

 i.>rm. growth, and pigment production [be mold was grown in Rauliu solution 



l.-uk u»c in various chemical agents, ami U was I.'un.l to It direct!) influenced b) the 



1'ii'M'iiiv or absence .a a large number of compounds. 



Some spontaneous variations Of Btorigmatocystis versicolor, r \ i iiiimis 

 ttb»»»/W. ffcwti, I s wris], . \ Che author 



- a brief Recount of some experiments with this interesting mold, theexperi 

 ments being the result of statements of Ooupin and Friedel (see above) in which 

 the) showed that tlu> culture medium exercised a definite influence on the growth 

 of the fungus, ami the investigations of Mirsky, which seemed to indicate that the 

 colored and green^colored forms of the mold, when cultivated under identical 

 conditions, did not change their color, 



Dhe color of this urn etcd bj theconidia, which are sometimes green and 



sometimes rose colored, and this color being soluble, stains the mycelium and sub 

 stratum on which the fungus is growing, rhe investigations of the author show that 

 tlu- fuugus has not definitely llxed varieties, but that through frequent rcplantings 

 norms irms appear among the rose colored cultures, and vice vt 



FERMENTATION BACTERIOLOGY 



Soil bacteria ami nitrogen assimilation, K. Ohks s 



/»/*> 94% djjW*. « • rhe author reviews some ol the literature relating to soil bacteria 

 and nitrogen assimilation, showing the important role played b) symbiosis in nitro- 

 gen assimilation by soil organisms, A discussion is given of the occurrence in the 

 of bacteria which are capable of fixing nitrogen, and the author claims that 

 nitrogen-fixing bacteria :vtv present in all soils and frequently in predominating 

 numbers, 



\ Us iot the identity of the bacteria which are contained in the 



substance Alinit. rhe principal organism [Baciitus eUenbachtHsin) in this substance 

 the author claims is identical with others « bich are commonly distributed through- 

 out the - which are usual dominating organisms of every sample 

 cammed. On this account the addition of Alinit to the soil would be 

 superfluous. 



A brief dis 11 ol the nitrogen-fixing bacteria in the root tuben 



wee, followed by an account of studies on nitrogen-fixing bacteria which have 

 been carried on by the author during the past year. Cultures of a number of organ- 

 isms were carried through various media, and the rvsnlts are shown, from which >t 

 appears that all the organisms under observation possessed the power of assimilating 

 free atmospheric nitrogen, although some of them to a very slight extent. The 

 nitrogen-fixing organisms which grow in symbiosis show increased power of asstmi- 

 n, but the amount is less than the sum of their individual capacil - 



rhe author discusses - the practical aspects of nitrogen fixation, showing 



that the organisms are usually present in all cultivated soils and are favored by alka- 

 line conditions I nseqnently be recommends deep plowing and thorough tilling 

 aa means for stimulating bacteria) activity, and the application of humus and time 

 to soils where they are needed. 



The bulletin concludes with an appendix giving technical descriptions of the dif- 

 spt eg i organisms referred to A brief bibliography is appended. 



The assimilation ot tree nitrogen by bacteria, u. S. Kku-s V . < ',: ." : 

 vSto, Rf>i. /.»*W, /»/». r . S I'his article describes briefly the various means 

 free nitrogen of the air and reports experiments on the influence of the character of 

 the medium upon the assimilation of nitrogen by bacteria, rhe method u- - - 



follow - 



■• Dwo hundred e culture hqui - aced in a BOO cc 



