BUREAU OF CHEMISTRY. 283 



Aisperg'dlus niger and Penicillium show a high degree of resistance 

 to metallic soaps. A paper covering the work on soaps of the heavy 

 metals is in i)reparation. Papei-s on methods of testing the Avater 

 resistance of fabrics and on testing the mildew resistance of fabrics 

 have been published. Farmers' Bulletin 1157, Waterproofing and 

 Mildewproofing of Cotton Duck, is in course of publication. 



NAVAL STORES. 



Department Bulletin 898, Turpentine: Its Sources, Properties^ 

 Uses, Transportation, and JMarketing, with Reconnnended Specifica- 

 tions, is in press. It endeavors to present to the producer and con- 

 sumer certam elementary \n\i ^ery important information of great 

 use to the industry. 



METHODS AND APPARATUS. 



Methods have been published for the estimation of monobromated 

 camphor in migraine tablets, of water solubles in leather, of iodid 

 and bromid in mineral Avaters and brines, of saccharin in urine, and 

 of caffeine in vegetable material. 



Papers have l)een published on the use of kaolin in tannin analyses 

 and on the combination of fractionation with spectrophotometry in 

 proximate organic analysis. Papers are in press on a color test for 

 oxalic acid and on the Kjeldahl nitrogen method and its modifica- 

 tions. Reports are in press upon methods for the estimation of phos- 

 phatides, for the detection of neutralizers in butter, for the estima- 

 tion of phenolphthalein, and for the separation of magnesium from 

 sodium antl potassium chlorids. 



As a by-product of the regular testing to which all chemical re- 

 agents purchased by the bureau are subjected, notes upon sulphuric 

 acid free from nitrates and the diphenylamine test for nitrates, upon 

 potassium ferricyanide, upon methyl orange, and upon the quality of 

 the chemicals received by the Bureau of Chemistry during the war 

 were published. 



There were distributed to the chemists of the bureau and to col- 

 laborating chemists information sheets containing critical discussions 

 of the methods of examining the following products: Condensed 

 milk, sweetened condensed milk, milk, cream, and 03'sters. 



ANALYTICAL WORK FOR OTHER DEPARTMENTS AND BUREAUS, 



Because of the return of the various Government establishments 

 ((I a normal basis, only about one-third as much analytical work 

 was done for them this year as last. The figures are collected in 

 Table 0. In addition, a number of extensive investigations were^ 

 can-ied out for other (Jovernment establishments, and much advisory 

 work on the prei)aration of specifications and the like was done. The 

 usual assistance was given the Post Office Department in connection 

 with fraud-order cases. 



For other bureaus of the Department of Agriculture a great deal 

 of analytical work was (Ume. For example, nearly 1,000 samples 

 of in.sectieides and fungicides were examined foi- the Insecticide and 



