38 EXPERIMENT STATION RECORD. 



nium sulphate sometimes obser\ed in practice is believed by the author 

 to be due to the use of too large aiuoutits of the salt. Damp weather 

 favors the benelicial effect of ammonium salts ])y diluting the soil solu- 

 tions, and dry weather increases its injurious effects by concentrating 

 them. The general conchision is drawn that ammonia is just as effect- 

 ive as a fertilizer as nitric nitrogen, hut that it nuist be used with 

 caution. 



Experiments on the preservation of barnyard manure, ^NI. Hoffmann {Dent. 

 LiDidir. rnxxc, ..'7 {I'JOO), Xo. ■.'!>, i>)). ■)■')-}, ■I'lo). — An aci'Diuit is given of tests of Sul- 

 farin, a commercial preiiaratinn in wliicli the preservative agent is snlplmric acid 

 (15 to 18 per cent). 



The question of the preservation of barnyard manure, J. Koemg {Fiililhig's 

 Landw. Ztcj., 49 {1900), Nos. 7, i)p- 373-276; 8, pp. 290-295).— This is a popular dis- 

 cussion of this subject, based upon investigations by the author and others, in which 

 it is (;laimed that the best results will be obtained in the numagenient of manure by 

 protection from access of air, rain, and sun, and by thorough rotting. 



On the construction of practical manure pits, II. Stru\ve {Deut. Landw. 

 i'msw, 27 (1900), No. 37, pp. 454, 455, fig>t. 10). — Plans and instructions for the con- 

 struction of different kinds of pits are given. 



Practical results of experiments in sew^ag-e treatment, T. W. H. Garstang 

 {Public Health, 12 {1900), Xo. 8, pp. 612-622). 



Report on the Government guano islands for the year 1899, C H. Jackson 

 {Agr. Jour. Cape Good Hope, 16 {1900), No. 8, pp. ^5-^5).— Statistics of collection 

 and shipments of guano from the Colonial and Ichaboe Islands are given, and the 

 price, extent of use, and possible future output are discussed. In 1899 the Colonial 

 Islands i)roduced 2,801 tons of guano, the Ieha1)oe Islands 2,211 tons. 



Commercial fertilizer calendar for the year 1900, M. Ullmann, editor {Notiz- 

 Kalender ilher die Anwendung kunstlkher Dungemittel far da.'i Jahr 1900. Hamlmrg: ,T. 

 H. Koch & Co., 1900, pp. 43). 



The composition and use of fertilizers, L. L. Van Slyke {Pennsijlvania Dept. 

 Agr. Bid. 55, pp. 132) . — A revised edition of Bulletin 94, new series, of the New York 

 State Station (E. S. R., 7, p. 853). 



Analysis of commercial fertilizers sold in Maryland, H. B. McDonnell et 

 al. {Mari/land Agr. Col. Quart., 1900, No. 7, pp. 67). — This bulletin discusses the 

 composition of plants, the nature and source of various fertilizing materials, the value 

 of plant and soil analysis for determining the fertilizer requirements of soils, the 

 market price and valuation of fertilizers, and home mixing of fertilizers; and gives 

 tables showing the census statistics (1860-1890) of fertilizer production in the United 

 States, the average composition of the more important fertilizing materials and of 

 farm manures, the fertilizing constituents of feeding stuffs and farm products, the 

 amount of plant food remaining in different kinds of soil 6 years after the application 

 of various fertilizers, the amount of fertilizing materials contained in different crops 

 grown on 1 acre, and analyses and valuations of 328 samples of fertilizing materials 

 examined at the college from August, 1899, to January, 1900, inclusive. There are 

 also given the text of the State fertilizer law and a supplementary list of fertilizers 

 licensed for sale in Maryland for the year ended February 1, 1900. 



Analyses of commercial fertilizers, W. F. Hand et al. {Mississippi Sta. Bui. 

 61, pp. 15). — This ])ulletin reports analyses and valuations of 48 samples of fertilizers 

 collected during Deceml)er, 1899, with some incidental explanation. 



Fertilizer analyses, B. W. Kilgoke {Bui. North Carolina >itaie Bd. Agr., 21 

 {1900), No. 4, pp. „V).— This bulletin gives notes on valuation, freight rates from the 

 seaboard to interior points of North Carolina, a list of fertilizers registered during 



