20 EXPERIMENT STATIO^^^ RECORD. 



have been developetl at only one place, viz. on Lafferty Creek, iu the western 



part of Independence County The developetl deiwsits occur between the 



Polk Bayou Limestone and the St. Clair marble. . . . The phosphate rock is 

 of sedimentary origin, and where develoi^eil is light-gray, homogeneous, and con- 

 glomeratic, the i>ebbles being the size of iieas and smaller." Analyses are re- 

 ported which show that the l>etter sjiecimeus of the phosj^hate (.-outaiu as high as 

 32 per cent of phosphoric acid. 



PhospJionis: ore at Alt. Hollj/ Siirinps. Pa.. G. W. Stose ipp. 47-1— 183 ■». — A 

 deposit of wavellite (aluminium phosphate) at this place is descril>ed and its 

 use for the manufacture of phosphorus is discussed. 



Geological Sarren puh1icatioii.s on itho-sithatrs and other mineral fertilizers 

 (p. -1S4).— A list of 2t> publications on this subject is given. 



On the changes which acid phosphates undergo \inder pressure or mechan- 

 ical deformation. W. .^princ, tBiiI. Sor. Chun. B> hj.. 21 ti.''"7i. Xo. 3. i>i>. '■>!- 

 10 J: Acail. Roii. Bel;/.. Bui. CI. sci.. 19in\ yo. 3. pp. 193-211). — It was observetl 

 that the primary phosphates undergo a certain amount of decomixjsition under 

 pressure or mec-hanical deformation, resulting, first, in the elimination of water 

 of hydration and. finally, in the liberation of a certain quantity of phosphoric 

 acid. The general effect is to facilitate reversion in certain phosphates. The 

 primary phosj^hates of calcium, sodium, and probably lithium form molecular 

 c-ombinations with their respec-tive sulphates. In the case of calcium comix>unds 

 this molecular combination is apparently insoluble in water and its formation, 

 therefore, wmtributes: to the reversion of the acid phosphates of calcinui. 



The influence of phosphates on the circulation of potash in soils. C. 

 ScHBEiBER (Rrr. Gt'ii. A'jroii.. n. ser.. 2 (2r"/7i. .Vo. 3. pp. 9'!-110\. — I'ot exi>eri- 

 ments with mono<-alcium phosphate and phosphatic slag on oats are rei»orted 

 from which the conclusions are drawn that l>oth monocalcium phosphate and 

 Thomas slag convert insoluble compounds of potash iu the soil into soluble 

 forms, the action of the Thomas slag in this resi>ect being somewhat inferior 

 to that of u)onocalcium ithosiihate. While the amount of jtotash thus set free 

 in these experiments was considerable, it was not sufficient to render the use of 

 IKJtassic fertilizers unnecessary. It was found also that small applications of 

 lime by setting free i>otash in the soil iucreasetl the effect of the phosphate. 

 In large applications, however, lime rendered the phosphoric acid insoluble and 

 depres.*sed the yield in case of both monocalcium phosphate and slag, but less in 

 case of slag than of sui>erphosphate. 



Algerian and Tunisian phosphates in 1906, .M.uzieres iEngrais. 22 (1907), 

 \o. 9. pp. 2<>.j-2ol\. — Statistic-s of the exploitation of these phosphate dejwsits 

 are given. 



Eesearches on glauconite, L. W. Collet and G. W. Lee (Proc. Roy. Soc. 

 Fdiii.. 2H [19<i.;-4U, Vo. ). pp. 23>^21iS. ph. 12. map 1). — This is a very c-omplete 

 study of the mineralogical character, jihysical proi>erties. chemical comix)sition. 

 formation, as-sociation with phosphoric concretions, and distribution of this 

 Iiotassic silicate, which is of considerable agricultural importance in c-onnection 

 with deposits of phosphates and green sand marl. The article is in French. 



A bibliograithy of 43 referenc-es to literature on the subje<-t is given. 



The use of potash salts on different soils and crops. Dexsch (lUuit. Lantlir. 

 Ztn.. 27 (I'.i'i'Tk Yo. 11. pp. >.>^s7i. — This is a brief discussion of the adapta- 

 bility of ix>tash salts to different soils and crops. 



CJommercial fertilizers, W. .1. .Ioxes and O. C. H.\ worth Uniliaiiu Sta. BuJ. 

 121, pp. .'/ti3-'>3s. map 1). — This bulletin summarizes the main provisions of the 

 Indiana fertilizer law. discus.ses briefly the results of ins[)ection. and gives in 

 tabular form the analyses of 870 samples of fertilizers inspected during 190C,. 

 The large percentage of samples examined which were l:>elow the guarantee in 



