AGRICULTUEAL BOTANY. 429 



Province is referred to. Tliere is no information as to the occurrence of such 

 deposits in other provinces. 



The settlement of the potash controversy (Chem. Indus. [Berlin], 34 

 (1911), No. 11, pp. 305, 300). — The terms on which the disagreement between 

 the Potash Syndicate and American purchasers was settled on May 21 are 

 briefly stated. 



Preparation of dicalcium phosphate, P. Palmaee (Teknisk Tidsskr., 40 

 (1910), p. 151; aha. in Chcni. Ztg., 35 (1911), No. 11, Repert., p. //3).— The 

 preparation of dicalcium phosphate by treatment of crude phosphate with acid 

 obtained by electrolysis of sodium chlorate or perchlorate with the subsequent 

 regeneration of the electrolyte is described in this article. The phosphoric 

 acid of the dicalcium phosphate obtained by this process was 35 per cent soluble 

 in citrate solution. 



On the after effects of phosphate, II. G. Soderbaum (Meddel. Ccntralanst. 

 Forsoksv. Jordhruk.sumrddet, 1911, No. 37, pp. 22, figs. 6; K. Landtbr. Akad. 

 JIandl. oeJi Tldski:, 50 (1911), No. 3, pp. 21S-236, figs. 6).— Comparative exi>eri- 

 ments with oats and barley fertilized with superphosphate, dicalcium or trical- 

 cium pho-sphate, or bone meal, applied either with or without lime, showed that 

 during a period of five years insoluble phosphates applied the first year pro- 

 duced an increase in crop yield amounting to about 70 per cent of that obtained 

 during the same time by a corresponding amount of soluble phosphoric acid 

 (superphosphate) which was likewise given the first year only. In cases where 

 the conditions, especially the lime factor, were less favorable for the assimila- 

 tion of the insoluble phosphoric acid, the increased yield was only 10 per cent or 

 less. In the opinion of the author it may properly be questioned whether the 

 after eft'ects of insoluble phosphates are of suflicient practical importance to be 

 considered in the calculation of the market value of bone meal and triphos- 

 phates. 



Use of lime on land ( [Philadelphia], 1911, 7. cd., pp. 8). — This is the seventh 

 edition of a small pamphlet " edited by the school of agriculture and experi- 

 ment station of the Pennsylvania State College," giving directions regarding the 

 use of lime on land and a list of dealers in agricultural lime, ground limestone, 

 and fertilizers in Pennsylvania. 



Fertilizers, C. S. Cathcart (New Jersey 8tas. Rpt. 1909, pp. 15-23). — This 

 is a brief report on fertilizer inspection in New Jersey in 1909 reported in detail 

 in Bulletins 223 and 224 of the station (E. S. R., 22, pp. 228, 625), and which 

 involved analyses of 762 samples of complete fertilizers representing the prod- 

 uct of 108 manufacturers, besides samples of miscellaneous fertilizing materials. 

 Tables are given showing the wholesale cost per pound of fertilizing constituents 

 in raw, unmixed materials, and the quality of the different brands of fertilizers 

 examined. 



Tabulated analyses of commercial fertilizers, W. Frear (Penn. Dept. Agr. 

 Bills. 199, pp. 105; 203, pp. 75). — These bulletins give the results of analyses 

 and valuations of fertilizers examined under state law in Pennsylvania during 

 1910. Of the 730 samples of complete fertilizers examined during 1910, 230 

 were deficient in one or more constituents. 



AGRICULTURAL BOTANY. 



Plant physiology, B. M. Duggar (Neio York, 1911, pp. XV-[-516, figs. I.'i5). — 

 This is one of the Rural Text-Book Series, and it is designed for the use of 

 students and general readers who are interested in the fundamental require- 

 ments of plants. 



