250 EXPERIMENT STATION RECORD. [Vol.41 



preparation, Burgundy mixture, for exami)lo, prepared by pouring copper sul- 

 phate into soda liaving very different composition and properties from tliat 

 involving the reverse process. The qualities of several liquids tested are dis- 

 cussed, as are various periods more or less favorable to the success of fungicidal 

 applications ; the i-elative efficacy of acid, alkaline, and neutral sprays and of the 

 constituents lime, soda, and carbon dioxid ; the significance of a difference in the 

 physical, associated with an apparent similarity in the chemical, composition 

 of the precipitate; the production and significance of adherence by different de- 

 vices ; and the effect of concentration. 



It is concluded that Burgundy prepared by slow or rapid pouring of either 

 main component into the other, with or without rapid stirring, gives practi- 

 cally the same results whether the reaction be acid, alkaline, or neutral, but that 

 when the precipitate has changed from blue to greenish-yellow and has passed 

 into the globular state it is almost without effect on downy mildew. This change 

 is more or less rapid according to the temperature and reaction of the mixture 

 and other complicating circumstances, such as the presence of carbon dioxid 

 and the adlierence of fine crystals to the leaves. 



Bordeaux is fully as efticacious as Burgundy mixture against downy mildew. 

 It is claimed that the occasional Inirning of leaves l)y the use of neutral or alka- 

 line Bordeaux mixture is due to the fact that the lime reacts with the copper 

 compound to form co]>per carbonate. 



A consideration of [carnation] yellows, E. M., R. Lamkey (Proc. Amer. Car- 

 nation Soc, 26 (Wit), pp. 25-35). — In a discussion of carnation yellows it was 

 stated that diseased plants show closure of the stomata, reduction in quantity 

 or quality of diastase resulting in starch accumulation, and excessive produc- 

 tion of oxidase which interferes with certain physiological functions. Other 

 internal changes are mentioned as being under investigation. Suggestions on 

 the improvement of the general situation in regard to yellows include control 

 and improvement of environmental conditions, mainly with a view to preven- 

 tion, and employment of strictly healthy plants to furnish cuttings. It is noted 

 that a few plant* of the cuttings of 191o seedlings have become badly yellowed. 

 The suggestion is made that these plants may have acted in a way analogous to 

 the behavior of human carriers of disease. 



ECONOMIC ZOOLOGY— ENTOMOLOGY. 



Mutanda ornithologica, VII, H. C. Oberiiolser (7'roc. Biol. »S'oc. Wash.. 32 

 (WW), pp. 127, 128). 



The status of the genus Centronyx Baird, H. C. Oberholseh (Prov. Biol. 

 »Sor. Md.Hh., 32 {1910), p. ////). 



The proper name for Limicola platyrhyncha, H. C. Oberholseb (Vroc. Biol. 

 Soc. iro.s-/i., 32 (IIU'J), p. l-'tO). 



The taxonomic position of the genus Ramphalcyon, H. C. Uheuiiolsek 

 {Proc. Biol. Soc. W(i»h., 32 {1919), p. I4O). 



The generic name of the rook, H. C. Oberholser {Proc. Biol. Soc. Wash., 32 

 {1919), p. IJfl). 



The status of the subgenus Sieberocitta, H. C. Oberholser {Proc. Biol. Soc. 

 ^yash., 32 {1919). pp. 135-137). 



Spizella arborea the proper name for the tree sparrow, H. C. Oberiiol,ser 

 {Proc. Biol. Sor. Ma-th., 32 {1919), p. t.i9). 



Methods in entomological field experimentation, AV. 1'. Flint. C. F. Turner, 

 and .T. .T. Davls (./owr. J']con. Ent., 12 {1919), No. 2, pp. 178-183, pi. 1). 



Organization for insect suppression, A. F. Burgess {Jour. Econ. Ent., 12 

 {1919), No. 2, pp. 136-Ul). 



