30 EXPEEIMENT STATION RECORD. 



ing 10 per cent thiosulpliate, and all but A. glaucus, A. niger, and Mucor 

 flourished in 40 per cent sodium thiosulphate. 



Belations of yeast and mold fungi to sodium thiosulphate, A. Kossowicz 

 and W. LoEW (Ztschr. Garimgsphysiol., 2 {1912), No. 2, pp. 87-103).— This is a 

 more detailed report of work summarized above. 



Spore formation in Aspergillus fumigatus, B. Sauton (Compt. Rend. Soc. 

 Biol. [Paris], 74 {1913), No. 1, pp. 38, 39 ) .—Previous investigations by the 

 author, Javillier, and Bertrand (E. S. R.. 26, p. 431; 27, pp. 129, 228; 28, p. 527) 

 have shown the dependence of certain molds, especially A. nigcr, upon various 

 substances for their development. In the present paper he gives an account of 

 experiments with A. fumigatus grown in Raulin culture medium, and as a result 

 concludes that sulphur, iron, manganese, and potaSvSium are as indisi)ensable to 

 the formation of the conidia of A. funiigatus as is oxygen. 



Bacterial tubercles in leaves, H. Mikhe {Umschau, 16 {1912), No. ^7, pp. 

 989-991, figs. //; a&s. in Ztschr. Landw. Versuchsw. Osterr., 15 {1912), No. 12, 

 p. 1303; Bot. CentU., 122 {WIS), No. 1, pp. 10, ii).— The author gives an 

 account of his studies on the alleged hereditary symbiosis of Ardisia crispa 

 with bacteria which are found in the buds and growing points, later developing 

 in the intercellular spaces and forming marginal tubercles on the leaves. 

 Cultures of Ardisia with and without nitrogen supply at first showed no differ- 

 ences, but after some months the former outgi-ew more and more the latter 

 cultures. 



Testing cultures of nodule-f orraing bacteria, K. F. Kellerman ( U. S. Dept. 

 Agr., Bur. Plant Indus. Circ. 120, pp. 3-5, fig. 1). — On account of the occasional 

 failure of cultures of Bacillus radicicola to inoculate a crop properly, investiga- 

 tions have been carried on to determine whether the bacteria which have 

 grown vigorously m culture media have deteriorated to the extent of being 

 unable to infect the leguminous roots and to produce nodules. During the past 

 year experiments were conducted in which plants were grown under control 

 conditions but as nearly normal as possible, and by the procedure adopted it 

 has beeu possible to distinguish sharply between the inoculating power of 

 apparently identical strains of bacteria. In the future all stock cultures 

 intended for distribution by the Department are to be tested in this manner. 



Smoke injury to plants, T. Bokorni' (Chem. Ztg., 36 {1912), No. Ill, pp. 

 1050, 1051; abs. in Jour. Chem. Soc. [London], 102 {1912), No. 600, II, p. 980).— 

 The author concludes from his experiments that the high sensitiveness of some 

 plants to tobacco smoke noted by Molisch (E. S. R., 27, p. 830) is not due to 

 nicotin, which in small quantities produces practically no injurious effect, nor 

 to carbon monoxid, which even in large quantity can only retard germination, 

 but that it is due to ammonia, which is thought to combine with the protoplasm 

 of the plant. 



The weeds of arable land. III, Winifred E. Brenchley {Ann. Bot. [Lon- 

 don], 27 {1913), No. 105, pp. lJfl-166). — In continuation of previous investiga- 

 tions on the relations existing between weeds and soils (E. S. R., 27, 

 p. 29), the author finds that there is a close association between the weeds of 

 arable land and the soils in which they grow, so far as drift soils as well as 

 those derived from the underlying rocks are concerned. This association may 

 be either general or local. A much closer relationship is believed to exist 

 between weeds and crops than has hitherto been recognized. This is considered 

 to be largely due to the conditions of cultivation of the various crops and to 

 their place in the rotations practiced. 



The chemical constitution of the latex of Euphorbia and the systematic 

 position of the plants, J. von Wiesner {Sitzber. K. Akad. Wiss. [Vienna], 

 Math. Naturw. Kl., 121 {1912), I, No. 2. pp. 79-101).— The author claims to 



