AGRICULTURAL CHEMISTRY AGROTECHXY. 713 



It could not Ije stati'd with certainly wlietluT tlie liariuni phylato obtained was 

 composed of a single salt of inosit. 



" Inosit was prepared from the barium phytate of rice bran by heatint; in 

 sealetl tubes to 150° C. about 2 t^m. of the salt with 20 cc. of 30 per cent 

 sulphuric acid for five hours. The suli)huric acid was prec-ipitated with barium 

 hydroxid, tlie excess of barium removed by carl)on dioxid. and the filtrate 

 evaporated to dryness. The residue was extracted with hot water and filtered. 

 The inosit was precipitated by ether and alcohol and recrystalized three times 

 as minute needles. These gave the Scherer reaction and melted at 223° 

 uncorrected." 



Presence of a glucosid in the sunflower, A. Zanotti (BoL Cliim. Farm., 53 

 (1914), pp. 4, 5; (lbs. in Jour. Chem. Soc. [London], 106 {lOlJf), No. 621, I, pp. 

 H13, Ol.'f). — In the leaves of tlie sunflower a glucosid of the probable formula 

 CnHi904N2 was found. The substance, however, has not yet been completely 

 purified. 



The chemistry of tobacco resins. J. von Degrazia (Fachl. Mitt. Osterr. 

 Tahakregic, 13 {1913), No. 3, pp. 109-117; abs. in Chem. Ztg., 38 {191Jf), No. J,l, 

 Rcpcrt., p. 189). — Haid, in the sixties of the past century, noted three different 

 constituents of tobacco resin, viz, kentuckylinic acid, CssHioOs, kentuckynoleic 

 acid. C:2H340c. and kentuckynie acid, C2:H4oOr, as well as a neutral resin. Ci2H2o02, 

 and an essential oil. Some of these results were verified by the author. A method 

 for purifying the resinous constituents is given. The following were noted: 

 a-Tobaccenic acid (probably identical with Ilaid's kentuckynie acid), a brittle, 

 dark brown, odorless mass: (3-tobaccenic acid, a dark green brittle mass (prob- 

 ably contaminated with chlorophyll) ; 7-tobaccenic acid, a thick, brownish fluid 

 substance; tobacco-resinol. the resin alcohol of tobacco, which in a pure state 

 consists of colorless needles having the composition (CcH,oO)x: and tobacco- 

 reseue, a reddish, thick, brown fluid mass having an odor like honey and an 

 empirical formula of CssHmO^ 



The essential oil which was found had a yellow color, a verj^ ])leasant odor, 

 and a refractive index of 1.48S2. No conclusions were drawn as to whether the 

 essential oil is the carrier of the tobacco aroma. 



The arsenates of lead, H. V. Tartae and E. H. Kobinson {.Jour. Amcr. Chem. 

 Soc., 36 {191-'f), No. 9, pp. 18/(3-1853). — "Taken as a whole, the literature indi- 

 cates that there are at least two common lead arsenates, lead hydrogen arsenate 

 and lead orthoarsenate ; that these two compounds are the main components 

 present in ordinary commercial lead arsenate: that lead pyroarsenate may 

 j>ossibly be present in the commercial salts; and that there is very little accu- 

 rate knowledge of the preparation and the chemical and physical properties of 

 the pure compounds. See also a note by Holland and Reed [K. S. R.. 28. p. 30S]." 



In this work a reliable method has been devised for the preparation of pure 

 lead hydrogen arsenate, but all attempts to jirepare pure lead orthoarsenate 

 were unsuccessful. " Fairly pure lead hydrogen arsenate is prepared by use 

 of the reaction between lead nitrate and disodivnn hydrogen arsenate." 



Lead pyroarsenate was prepared and a new basic lead arsenate of apparently 

 constant composition was obtained. " The specific gravity of lead hydrogen 

 arsenate and basic lead arsenate have been determined. The difficulties attend- 

 ing the accurate determination of the solubility of the comjiounds prepared 

 have been pointed out. The tests made, however, show these substances to be 

 relatively insoluble." 



According to the authors there is at the jn-esent time no method for estimat- 

 ing the amount of lead hydrogen arsenate in commercial arsenate of lead. It 

 was found that " since the basic arsenate may be considered as insoluble from 



