735 



plats, 96, 94, and 92 bushels per acre, indicate that the land selected 

 was quite even in fertility. The largest yield was with barn-yard 

 manure — 238 bushels per acre; the average with the "prepared fertil- 

 izers " was 178 bushels, varying from 150 to 194 ; with ashes, 130 bush- 

 els ; with a single element (either potash or phosphoric acid), 124 

 bushels ; with two elements (potash and phosphoric acid) used together, 

 206 ; and the average of various combinations of all three elements, 210 

 bushels. The author believes that "more potash is needed than 

 the prepared fertilizers furnish." In this experiment the value of the 

 gain in yield from one dollar's worth of fertilizer was with barn-yard 

 manure $3.60, with the complete "chemical" fertilizers $5.80, with the 

 best combination of chemicals $7, and with the "prepared fertilizers" 

 $4.20. No mention is made, however, of the residue of fertilizing 

 materials left in the soil for future crops. The author repeats the 

 conclusions arrived at in previous experiments, that " chemicals when 

 l)roperly mixed, can fully take the place of farm-yard manure," and that 

 in New Hampshire they "can and do give greater increase of crop 

 than commercial fertilizers" (See Bulletin No. 10 of the station, or 

 Experiment Station Kecord, Vol, II, p. 412). 



Directions are given as to " how to get chemical fertilizers," and the 

 formulas for home-mixed fertilizers for corn and potatoes are reprinted 

 from Bulletins Nos. 6 and 10 of the station. 



NewYork State Station, Bulletin No. 27 (New Series), February, 1891 (pp. 20). 



General principles underlying the use op fertilizers, P. 

 Collier, Ph. D. (pp. 416-430).— This is a conclusion of the popular 

 treatise on the principles underlying the use of fertilizers, begun in 

 Bulletin No. 26 (new series) of the station (See Experiment Station 

 Eecord, Vol. II, p. 659), and treats of certain constituents of plants, the 

 most important elements of plant food in relation to fertilizers, the 

 constituents of soils, and the relations of plants and soils. 



Fertilizer analyses, P.Collier, Ph. D. (pp. 431-435). — The anal- 

 yses are given of 20 samples of commercial fertilizers collected in the 

 State in the fall of 1890. 



New York State Station, Bulletin No. 28 (New Series), April, 1891 (pp. 9). 



Pig FEEDING experiments with coarse foods, p. Collier, Ph. 

 D. (pp. 436-445). — "At different times during the year 1890 and the fol- 

 lowing winter feeding trials liave been made with various coarse foods 

 that are commonly grown on the farms of this State, many of which are 

 often recommended for swine." 



Priclley comfrey. — Two pens of Cheshire pigs, each pen containing two 

 sows and a barrow, were fed from June 27 to July 18 "all the prickley com- 

 frey they would eat, and a little corn meal. The comfrey formed over 

 90 per cent of the total food consumed in both pens." The tabulated 



