AGRICULTURAL CHEMISTRY AGROTECHNY. 115 



tenth-normal silver nitrate used is multiplied by 0-198 to obtain tlie weight of 

 allyl thiocarbimid in 100 gm. of the mustard. The following percentage quan- 

 tities of mustard oil (as allyl thiocarbimid) were found in samples of black 

 mustard of different origin : English, 1.39, Greek 1.20, French 1.08, Sicilian 0.99, 

 Italian 0.99, and Bombay 0.81 per cent." 



Oflacial methods of analysis adopted by the Texas Cotton Seed Crushers' 

 Association (0/7, Paint and Drug Reporter, 82 {1912), A^J. 6, p. J^c).— The 

 methods are for moisture, oil, ammonia and protein nitrogen, total fatty acids, 

 and refinery losses. 



Method for determining the amount of cotton-seed hulls in cotton-seed 

 meal, C. J. Kole {Yerslag. Landhomck. Onderzoelz. RijJcslandbouicproefstat. 

 [XetherJands], 1912, No. 12, pp. 3^-47). — It is not deemed possible to obtain 

 a good separation of hulls and meal body by sifting. Determining the crude 

 fiber may give a clew as to whether a large or a small amount of hulls is 

 present in the meal, but the results obtained are not accurate. 



The National Experiment and Seed Control Station of Holland, located at 

 Wageningen, uses the following method: Five gm. of the sample is treated in 

 a cylinder with 300 cc. of boiling water and allowed to stand for at least 4 

 hours. The supernatant fluid is then poured off, and the residue is brouglit 

 upon a piece of gauze (15 by 15 cm., mesh 10 microns) with the aid of a stream 

 of water. The 4 ends of the gauze are brought together and the mass kneaded 

 with the fingers for the purpose of reducing its size. The mass is then washed 

 back into the cylinder, and when the hulls have sunk the fluid containing the 

 floating particles of meal body is poured off. The cylinder is filled again with 

 water, and when the coarse particles of hull have subsided, the supernatant 

 fluid containing the fine particles of shell and coarse particles of meal is trans- 

 ferred to the gauze. The mass is then rubbed up in a mortar and transferred 

 again to the cylinder. These processes are repeated until all meal body has 

 been removed, when the residue, representing the hulls, is dried. The weight 

 of these hulls is multiplied by an empirical factor 100 -^ 72, which gives the 

 amount of hulls present in the sample. 



It is stated that cotton-seed meal commonly contains about 15 per cent of 

 hulls. 



The determination of formaldehyde, E. Rimini and T. Jona {Gior. Farm, 

 e Chim., 61 {1912), Xo. 2, pp. 49-56; ahs. in Clicm. Ztg., 36 {1912), Xo. 87, 

 Rcpert., p. 401; Chcm. ZcnihJ., 1912, I, Xo. 14, p. ii//7).— Rieglers method, 

 based on the conversion of formaldehyde into formalazin by the addition of a 

 known amount of hydrazin, decomposing the excess of the latter with iodic 

 acid and measuring the resulting nitrogen, is deemed inaccurate because 

 formalazin is also decomposed in an acid solution. Consequently the author de- 

 composes the hydrazin in an alkaline solution in which formalazin is perfectly 

 stable. Potassium iodate can not be used instead of iodic acid. 



Extraction of oil by aspiration, J. Chapelle and J. Ruby {Jour. Apr. Prat., 

 n. ser., 24 {1912), Xos. 48, pp. 686-688, figs. 2; 49, pp. 119-121, fig. 1).—A, 

 detailed description of a method for depriving olives of their oil by aspiration. 

 The machinery required is illustrated. 



The effect of kiln drying at 145° F. on the composition of the hop, H. Y. 

 Tartar and B. Pilkingtox {Jour. Indu,s. and Engin. Chem., 4 {1912), Xo. 11, 

 pp. 839, 840).— The proper temperature to be used in the kiln dryi"S of hops 

 still being a question in dispute, the authors were prompted to repeat in a lim- 

 ited way some of the work which has been reported by other investigators. 

 For this test 7 samples of Pacific coast hops were used. The temperature used 

 in kiln drying in each instance varied between 120° and 145" F., the latter being 

 the one which is preferred at the present time by Oregon hop growers. " The 



