FERTILIZEKS. 931 



phosphatie fertilizers in general and a description of the particular 

 phosphates used in these exporiuKuits, a record of treatment and 

 cultivation of the plats since the begiiuiiiig- of the experiments, and a 

 tabular sunnnary and discussion of the data obtained in experiments 

 with the different phosphates on corn, wheat, rye, and crimson clover. 

 The results ai"c sunnnarized as follows: 



"(1) All forms of phosphoric acid produced an increase of crop. 



"(2) The average total yield of the crops fertilized with insoluble phosphoric 

 acid was greater than those with the soluble and reverted forms of phosphoric acid. 



"(3) Reverted jihosphoric acid gave a greater total yield than soluble phosphoric 

 acid. 



"(4) Reverted ]>hosphate of iron and alumina gave a higher yield than reverted 

 phosphate of Hine. 



"(5) Soluble jihosphoric acid gave slightly higher yields of wheat (grain) than 

 phosphoric acid in any other form. 



"(6) Concentrated sources of soiul)le phosphoric acid gave l)etter results than the 

 low grade sources. 



" (7) Untreated South ( 'aroHna rock gave a higher total yield than dissolved South 

 Carolina rock. 



"(8) Slag phosphate produced a greater total yield and at less cost than tlie average 

 of the soluble phosphoric acid plats and the bone meal plats. 



"(9) Insoluble phosphoric acid from slag produced a greater yield than the 

 insoluble phosphoric acid from South Carolina rock and Florida soft phosphate, l)ut 

 at greater cost than the two latter. 



"(10) For the best results with insoluble phosphates, it is desirable to have the 

 land well filled with organic matter. Of the methods tested, crimson clover was the 

 best means of obtaining this." 



Commercial fertilizers, PI H. Jp:nkins, S. W. Johnson, et al. 

 {Con)irrf!ci(f State Sta. Ept. 1900, j>t. 1, pp. ii^).— This includes a 

 statement of fertilizer sales in Connecticut in 1900, the text and an 

 abstract of the State laws relating to fertilizers, a list of manufacturers 

 securing licenses under these laws, notes on the sampling and collect- 

 ing of fertilizers, explanations regarding the analysis and valuation of 

 fertilizers, a report on determinations of the solubility of organic 

 forms of nitrogen in pepsin-hydrochloric acid, a review of the fertili- 

 zer market for the year ended October 31. 1900, and tabulated analyses 

 and valuations of 466 samples of fertilizing materials, including nitrate 

 of soda, sulphate of ammonia, dried blood, cotton-seed meal, castor 

 pomace, ground fish, tankage, bone manures, dicalcium phosi)hate. 

 superphosphate, nuiriate of potash, sulphate of potash, sulphate of 

 potash and magnesia, kainit, carbonate of potash, nitrate of potash, 

 cotton-hull ashes, wood ashes, limekiln ashes, crematory ashes, lime, 

 land plaster, waste from acetylene manufacture, tol)acco stems, nuick, 

 sheep manure, street sweepings, silk-mill waste. The average cost of 

 nitrogen in 4 samples of nitrate of soda examined was 11:. 3 cts. per 

 pound; in 1 sample of sulphate of anmionia, 18.5 cts. ; in 14 samples of 

 cotton-seed meal, 14.3 cts., "nearly a cent and a half per pound more 

 than last year. This is due to an in(;reased foreign demand for cotton 

 seed meal." The price per pound of nitrogen in 5 samples of castor 



