956 
Journal of Agricultural Research 
Vol. XXXI, No. 10 
LITERATURE CITED 
(1) Anonymous. 
1907. THE MAINTENANCE OF FERTILITY. STATISTICS OF PRODUCTION IN 
FIELD EXPERIMENTS WITH FERTILIZERS AND MANURES FROM 
1894 to 1906, inclusive. Ohio Agr. Exp. Sta. Bui. 184: 229-305. 
1908. the probable error of a mean. By Student. Biometrika 
6:1-25, illus. 
(3) - 
1908-12. PLANS and summary tables of the experiments at the 
CENTRAL FARM, WOOSTER, ON THE MAINTENANCE OF SOIL 
FERTILITY. ARRANGED FOR REFERENCE IN THE FIELD. 
Ohio Agr. Exp. Sta. Circ. 83, 24 p., illus., 1908; 92, 32 p., 
illus., 1909; 104, 20 p., illus., 1910; 114, 21 p., illus., 1911; 
120: 95-115, illus., 1912. 
(4) - 
1913-14. PLANS AND SUMMARY TABLES OF THE EXPERIMENTS AT THE 
CENTRAL FARM, WOOSTER AND THE NORTHEASTERN TEST 
FARM, STRONGSVILLE, ON THE MAINTENANCE OF SOIL FER¬ 
TILITY. ARRANGED FOR REFERENCE IN THE FIELD. Ohio 
Agr. Exp. Sta. Cite. 131, 40 p., illus., 1913; 144: 63-97, 
illus., 1914. 
(5) - 
1917. TABLES FOR ESTIMATING THE PROBABILITY THAT THE MEAN OF A 
UNIQUE SAMPLE OF OBSERVATIONS LIES BETWEEN -oO AND ANY 
GIVEN DISTANCE OF THE MEAN OF THE POPULATION FROM WHICH 
the sample is drawn. By “Student.” Biometrika 11: 414- 
417. 
(6) Anthony, R. D., and Waring, J. H. 
1922. METHODS OF INTERPRETING YIELD RECORDS IN APPLE FERTILIZA¬ 
TION experiments. Pa. Agr. Exp. Sta. Bui. 173, 42 p., illus. 
(7) Gardner, F. D., Noll, C. F., and Lewis, R. D. 
1922. FORTY YEARS* RESULTS WITH FERTILIZERS. GENERAL FERTILIZER 
experiments. Pa. Agr. Exp. Sta. Bui. 175, 23 p., illus. 
(8) Love, H. H., and Brunson, A. M. 
1924. student’s method for interpreting paired experiments. 
Jour. Amer. Soc. Agron. 16: 60-68. 
(9) - 
1924. a modification of student s table for use in interpreting 
experimental results. Jour. Amer. Soc. Agron. 16: 68-73. 
(10) Schuster, G. L. 
1924. FIFTEEN YEARS OF FIELD EXPERIMENTS WITH MANURE, FERTILIZERS 
and lime. Del. Agr. Exp. Sta. Bui. 137 (Tech. Bui. 4), 45 p., 
illus. 
(11) WlGGANS, R. G. 
1924. EXPERIMENTS IN CROP ROTATION AND FERTILIZATION. N. Y. 
Cornell Agr. Exp. Sta. Bui. 434, 56 p.. illus. 
