210 KXI'EKIMENT STATION RPXORD. 



per ciMit fatty acids. Ki.lJ ikt (vnt .u;lyc»'r(.l ), (M).". per (-(Mit unsapouitiable 



inatttT. <>.(■>.■> ptT coiit five fatty arids. 



(I. ."lit pi'r coat sulublc fatty acids 



0. 1!> Reicbert-Meissl number 



(1.11 por cent volatile fatty acids 



, , . ^ ... I Palmitic acid 

 ir>. ol per cent insoluble fatty 



!»r..T() Iter cent total fatty acids. 

 Neutralization number, 200.57, 

 Mean molecular weight, 279.99. 



Oleic acid 

 acids. L . , . . , 



Lmoleic acid 



Aeiilralization number, 200.22 

 .Mean molecular weight, 2S0.48 



The acidity, sulphite content, and color of gluten feed, 1'. Y. (Joi.nsMiTH 

 (.yassdrlni.sctts Sht. Ix'pt. I90S, pt. 2, pi). 139-lfiS). — Dark feeds have a stronger 

 acid reaction to i)benolphthaleiu than the lighter ones. The acidity which is 

 present is an apparent acidity, as shown by the results with the indicators 

 phenolplithalein jind methyl orange and, further, by sulphate and chlorid de- 

 lerminations. The .•iiithor, therefore, presumes that the acidity is due to some 

 form of phosphorus. Sulphites were present in only very small amounts, while 

 anilin coloring matter was evident in SO per cent of all the feeds examined. An 

 aqueous extract of the feed showed a large amount of phosphoric acid, prob- 

 ably in combination with potassium and magnesium, and which may exist in 

 the feed as some organic complex such as the phytin of wheat bran. 



Chemical conversion tables, H. B. Battle and W. J. Gascoyne (Baltimore, 

 M(l., 1909. pp. 119). — This publication is a successor to that published by II. B. 

 Battle and F. B. Dancy in 18S.5. Its particular application for the agricultural 

 chemist is for the analysis of commercial fertilizers, cotton seed, iron, and food 

 products. New additions made in this edition include alumina, chlorin, sul- 

 phur, i)h()si)horus, silicon, manganese, and magnesia tables. 



Gravimetric estimation of nitric acid, M. Busch (Zt.scJir. Aiialjjt. Chcin., 

 J,8 {1909). No. 6, pp. 368-370; ahs. in Jour. Chem. Soc. [London], 96 (1909), No. 

 561, II, p. 615).— A reply to Hes (E. S. R., 20, p. 1104). The use of dried filters 

 is deemed ob.1ecti enable. With reference to the concentration to be employed, 

 the author believes that 10 to 12 cc. of a 10 per cent solution of nitron acetate 

 should be added to SO-lOO cc. of the solution to be examined. As Hes employs 

 5 cc. to 250 cc, and finally 5 cc. to 750-1,000 cc, this may explain his failure 

 to get accurate results with the nitron method for nitrates in water. 



Busch's nitron process, P. Pooth (Ztschr. AikiIiiI. Chciii.. J/S (1909), No. 6, 

 pp. 375, 376; ahs. in ./our. Chem. Soc. [London], 96 (1909). No. 561, II, p. 615).— 

 To get accurate results, only small quantities of nitron solution should be added 

 at a time. The nitron should be kept in a dark place. The hydrochloric-acid 

 content should not exceed 1(K» cc normal solution for every 0.1 gm. of nitrate. 



[Colorimetric method for the determination of phosphorus], R. B. Gibson 

 and ('. Estes (Jour. Biol. Chem.. 6 {l!M>9), No. J,, pp. 3 'i 9 -3 57). —An indirect 

 method. 



To an aliquot of a solution of a fusion containing about 0.04 to 0.1 per cent 

 of phosphorus are added ammonium hydroxid to a little in excess of neutrality, 

 5 cc. of an acetic-acid solution (20 gm. of sodium acetate and 100 cc. of 30 per 

 cent acetic acid, filled up to 1,000 cc. with water), and 50 cc. of uranium acetate 

 solution (0.7092 gm. jter liter). The mixture is made up to 100 cc. and allowed 

 to stand over night, following which 10 cc. of the clear filtrate is treated with 

 1.5 cc. of a 10 per cent potassium ferrocyanid solution and diluted to 100 cc. 

 This solution is then cvmipared as to color with a blank (minus the phosphate) 

 which has been prepared in the same way. The calculation is as follows : Un- 

 known : Known=50 cc. : x CC. 



