652 EXPERIMENT STATION RECORD. 



hv wiiriii or cool watt'i-. In one scrii-s :i t('iii|>ci;iliiii' of (> to S" ('. was inaiiitaiiu'<l; 

 ill thesecoiul 12 to 17° C;., and in tht^ tliird 2(j to oO° C. The (U'Vi-lopiuent of tlie 

 plants i)rocee(le(l norinally. All the vessels were kej)t in the oj)eii air from ^Nlay 29 

 to the end of Septeiiilu'r. 



A tabulated report is giviui of the growth of the. different plants, in which it 

 ai)i)ear.s that tlie mustard made the greatest growth at the highest soil temperature, 

 the oats at the medium temperature, and flax at the lowest. Th(> smallest produc- 

 tion t)f tlie different i)lants was in the inverse order of the maxinium. In regard 

 to the underground development, the weight of the roots of all tlii- jilants was found 

 to be greatest in the ccjolest soil. This was ijarticularly noticeable in tlie c-ase of the 

 oats. The weight of the roots of the oats in the cooled soil was 21.87 gm., as com- 

 pared with 14.98 gm. in the warmest, and 17.27 gm. in tlie medium temperature. 

 From this it is concluded that a soil temperature of from 6 to 9° is the Ijest for the 

 develojiment of the roots of oats. — p. fireman. 



The influence of colored glass on the red and yello'w pigments in plants, 

 E. Laurent (Rev. Hort. Beige, 28 {1902), No. 11, p. 243; abs. in. Jour. Ituij. Hurt. Sac. 

 [London], 28 (190.3), No. 1-2, p. 244)- — Experiments are reported with Teluntliera 

 versicolor of a jironounced red foliage in frames with red and blue glass. None of the 

 glasses was monochromatic. Under the red and blue glass the leaves all became 

 green, and after a month's interval the leaves produced were smaller than normal. 

 A variety of Coleus, with large leaves, green at the base and reddish-violet toward 

 the tips, bore normal leaves under clear glass, but under the red and blue glass the 

 leaves were diminished and the colored parts became more and more reduced, while 

 the flowers were green. Similar results were obtained with a number of other plants. 

 A zonal pelargonium became entirely green under the red and blue glass. 



The results of the experiments show that a brilliant light favors high coloration of 

 foliage, as can lie shown in purple-leaved trees, the coloring matter of the leaves 

 being dependent upon their assimilation. Trees and shrubs wdth golden leaves 

 when poorly illuminated became green. Red glass induced etiolation in some 

 species, and under the blue glass the stems of many were decidedly shortened. These 

 experiments are said to show that the yellow pigment of the foliage is a product of 

 assimilation. 



The influence of Aspergillus niger on the transformation of the albumi- 

 noids in peas, I. S. Kosyachenko [Zhur. Opuitn. Agron. \_Jour. Expt. Landn'.], 

 4 [1903), No. 4, PP- 4^9-449).— Since 1896 the hygienic laboratory of the Kharkov 

 Veterinary Institute has conducted investigations relative to the transformation of 

 the nitrogenous substances in various fodder products w'hich were infested with 

 molds. These investigations have shown that, in the development of molds on grain 

 products containing in their comj^osition more than 10 per cent proteid substances, 

 simultaneously with the decrease of the total quantity of nitrogenous substances 

 there is a decrease of the true albuminoid sul^stances. 



A quantitative analysis of the prodiicts of decomposition under the influence of 

 molds was made, the studies being carried on with ground peas subjected for 64 days 

 to cultures of Aspergillus niger. The products of the decomjiosition of the proteid 

 substance of the peas under the influence of pure cultures of the fungus were found 

 to be tyrosin and leucin, and varioxis hexose bases such as arginin, lysin, etc. — 

 p. fireman. 



The physiological principles of plant culture, C. Kraus {Naturir. Zischr. 

 Land- u. Forstiv., 1 {1903), Nos. 5, pp. 180-200; 6, j)p. 220-236; 7, pp. 268-279; 9, pp. 

 342-367).— A discussion is given of the principles of plant growth, breeding, and 

 improvement as illustrated with beets. 



Poisoning by Lepiota morgani, F. L. Stevens {Jour. Mycol, 9 {1903), No. 68, 

 pp. 220-222). — An account is given of the injurious effect on the author of this mush- 

 room, which is frequently considered as edible. The symptoms produced by the 



