RECENT WORK IN AGRICULTURAL SCIENCE. 



AGRICULTURAL CHEMISTRY— AGROTECHNY. 



Industrial chemistry, edited by A. Rogers, A. B. Aubebt, et al. (Ncio York, 

 1912, PI). XlV-rSo'f, figs. SJfO). — This large manual, wliich is intended for 

 students in industrial chemistiy and manufacturers, is edited by experts in 

 their respective lines. The topics dealt with are as follows: Fertilizers; oils, 

 fats, and waxes ; the metallurgy of iron and steel ; resins, oleo-resins, gum- 

 resins, and gums ; sugar ; starch, glucose, dextrin, and gluten ; brewing and 

 malting; wine making; distilled liquors; casein; leather; and the art of paper 

 making. 



Progress made in chemistry as applied to the fermentation industry, 

 O. MoHR {Ztschr. Angew. Chem., 25 (1912). No. 22, pp. 1102-1110).— This 

 is a review of the more important work in the fermentation industry during 

 1911. It deals with the chemistry and handling of raw materials, fermen- 

 tation organisms, conducting the fermentation process, and the products of 

 fermentation. 



Fig. 1. — Humidity regulator, general view. 



Landolt-Bbrnstein physical-chemical tables, edited by R. Bornstein and 

 W. A. Roth (Lanclolt-Bonistein PhyfiikaUsch-Cheinische Tabellen. Berlin, 1912, 

 ff. ed., rev. and enl., pp. XVI +1313). — This is the fourth revised and enlarged 

 edition of this well-known book of tables. 



A humidity regulator, W. M. Clakk (U. 8. Dept. Agr., Bur. Anim. Indus. 

 Circ. 211, pp. 6, figs. 2). — Despite the fact that many devices have been used for 

 the automatic maintenance of constant temperature, very little has been done 

 in the way of constructing an apparatus for regulating humidity for scientific 

 investigation in the field of plant physiology, or any other phenomena influenced 

 by the humidity of the surrounding air. 



For some studies in cheese ripening, a humidity-regulating apparatus was 

 constructed which operates on the principle of the wet and dry bulb hygrometer. 

 The apparatus (fig. 1) consists *' of a dry bulb A and a bulb B kept moist by a 

 96700°— No. 2—13 2 107 



