ABSTRACTS OF PUBLICATIONS OF THE AGRICULTURAL EXPERIMENT STATIONS 

 IN THE UNITED STATES. 



Connecticut State Station, Bulletin No. 109, August, 1891 (pp. 40). 



Fertilizers. — Tabulated analyses are given of 57 samples of iiitrog- 

 •euous siii3eri)liospliates and 38 samples of special manures collected 

 during tlie present year, and of 19 home mixtures. 



Of the 57 brands [of nitrogenous superiihosphates] here reported, 14 are below 

 their minimnm guaranty in respect of one ingredient, and 6 in respect of two ingre- 

 dients. That is, one tliird of all the nitrogenons snperphosphates in our market con- 

 tain less of one or of several ingredients than they are claimed to contain. * * * 



[Of the 38 special manures] 11 brands are below the maker's guaranty in respect 

 of one ingredient, 2 in respect of two ingredients, and 1 brand is below in all three. 

 * * * A comparison of the average composition of these special manures with 

 that of the other nitrogenous superphosphates shows the former to contain on the 

 Avhole considerably more nitrogen, nearly twice as much jxitash, and somewhat less 

 phosphoric acid than the latter. * * * 



Comparing the home mixtures with the special manures it is seen that the former 

 contain on the average (14 analyses) half of 1 per cent more nitrogen, over 1.5 per 

 cent more phosphoric acid, and slightly more potash than the latter. 



The average cost of the materials of which these mixtures were made, delivered, 

 was $34.82. To this must be added the cost of screening and mixing. * * « jf 

 the average cost of the mixed materials is placed at $37 ])er ton it will probably 

 fully cover all expense in every case. 



On this basis of averages the home mixtures, containing consider- 

 ably more of both nitrogen and phosphoric acid and slightly more 

 potash than the special manures, have cost $37 per ton, or 0.2 per cent 

 more than the station's valuation of the ingredients; the si)ecial 

 manures have cost $38.70, or 23.7 j^er cent more than the station's 

 valuation ; and the nitrogenous super])hosphates, which contained con- 

 siderably less nitrogen and about half as much j^otash but somcAvhat 

 more phosphoric acid than the special manures, have cost $33.97, or 20.7 * 

 per cent more than the station's valuation. 



Connecticut Storrs Station, Bulletin No. 7, September, 1891 (pp. 16). 



Chemistry and ecoinomy of food, W. O. Atwater, Ph. D., 

 AND C. D. Woods, B. S. — This is a brief resume of the results of 

 inquiries carried on by the authors for a luimber of years. Detailed 

 accounts of these investigations will be published in the Annual Report 

 of the station for 1891, Besides general explanations regarding the 

 chemical composition and digestibility of foods, and the principles of 

 food economy, the bulletin contains seven tables with data as follows: 



213 



