CHEMISTRY. 219 



soluble in water was extracted and the residue treated with a large 

 quantity of water charged with carbon dioxid. By this means 0.1G1 

 gm. of tricalcium phosphate per liter was dissolved from the residue 

 insoluble in water, an amount very nearly identical with that dissolved 

 by treating tricalcium phosphate in the same way. 



These results indicate that when superphosphates are applied to the 

 soil, although a large part of the soluble phosphoric acid is converted 

 into the tricalcium form, it is so uniformly distributed throughout the 

 soil that it is readily dissolved by the carbon dioxid present in the soil 

 or by the acids secreted by the roots of plants. 



A method for distinguishing bone phosphate from mineral 

 phosphate, F. Marttnotti (Staz. Sper. Agr. Ital, 30 {1897), N~o. 8, 

 pp. 663-668). — The method is based upon the difference in silica con- 

 tent of the different kinds of phosphates. The silica is removed before 

 the determination of phosphoric acid by evaporating the acid solutions 

 to dryness. In the large series of analyses reported the smallest 

 amount of silica found in mineral phosphates was 5.25 per cent, while 

 the greatest amount found in bone phosphates was 0.9 per cent. In 

 bone ash as high as 3 per cent of silica was found. In superphosphates 

 prepared from mineral phosphates the minimum amount of silica was 

 1.2 per cent. In case of bone ash superphosphates the maximum silica 

 content was 0.8 per cent. Double superphosphates were found to 

 contain about 3 per cent of silica. In a mixture of bone superphos- 

 phate and mineral superphosphate the smallest amount of silica found 

 was 2.26 per cent. 



From his investigations the author draws the conclusions that (1) 

 mineral phosphates can be distinguished from bone phosphates by the 

 relative quantities of silica which they contain; and (2) bone phosphates 

 and bone superphosphates that contain more than from 0.8 to 1 per 

 cent of silica are adulterated with mineral phosphates and mineral 

 superphosphates. 



Proteids of the soy bean, T. B. Osborne and G. F. Campbell (Jour. Amer. Chem. 

 Soc, 20 {189S), No. 6, pp. 419-428). — Reprinted from Connecticut State Station Report 

 for 1897 (see p. 218). 



Proteids of the pea, lentil, horse bean, and vetch, T. B. Osborne and G. F. 

 Campbell (Jour. Amer. Chem. Soc, 20 (1898), Nos. 5, pp. 348-375; 6, pp. 393-419).— A. 

 series of papers reprinted from Connecticut State Station Report for 1897 (seep. 214). 



On the chemistry of chlorophyll, L. Marchlewski (Jour. PraJct. Chem., 1S98, 

 Nos. 5-7, pp. 330-334). 



On the sugar in orange peel, J. Flatau and H. Tabbe (Bui. Soc. Chim. Paris, 3. 

 ser., 19 (1898), No. 9, p. 408). 



The formation of cane sugar from dextrose in the cell, J. Gruss (Ztschr. Ver. 

 Riibenz. Ind., 189S, No. 507, pp. 333-343). 



Composition of the ashes of some raw tanning materials, W. K. Alsop and 

 J. H. Yocum (Jour. Amer. Chem. Soc, 20 (1898), No. 5, pp. 338-340).— Analyses of 

 chestnut-oak bark, hemlock bark, quebracho vrood, and oak-bark extract. 



