8 i 4 
Journal of Agricultural Research 
Vol. XXIV, Nat 
(5) H0AGI.AND, D. R. 
1920. OPTIMUM nutrient SOI.UTIONS POR PLANTS. In Science, n. s., v. 52, 
p. 562-564. 
(6) K^LLiSY, W. P., and Cummins, A. B. 
1920. COMPOSITION OP NORMAL AND MOTTLl^D CITRUS LEAVES. In JoUT. AgT. 
, , Research, v. 20, p. 161-191. I^iteratnre cited, p. iqo-iqi. 
(7) MaciNTiRE, W. H., and MooERS, C. A. 
1921. A PITLESS LYSIMETER EQUIPMENT. In Soil Sci., V. II, p. 207-214, I fig., 
2 pi. 
(8) Mann, Gustav. 
1906. THE CHEMISTRY OP PROTEiDS. xviii, 6o6 p. London, New York. Bib¬ 
liographical footnotes. 
(9) Shive, John W. 
1920. THE INPLUENCE OP SAND UPON THE CONCENTRATION AND REACTION OP A 
NUTRIENT SOLUTION POR PLANTS. In Soil Sci., V. 9, p. 169-179. 
References, p. 179. 
(10) Stewart, John P. 
1918. THE PERTILIZATION OP APPLE ORCHARDS. Pa. AgT. Exp. Sta. Bul. 153, 
31 p., I fig. 
(11) Wester, D. H. 
1920. SUR DIPPJ^RENTES M^THODES DE DETERMINATION DU MANGANESE ET 
LEUR UTILITE DANS L'EXAMEN DES CENDRES DE vEgETAUX, ET 
PRODUITS similairEs. In Rec. Trav. China. Pays-Bas, t. 39, p. 414-422. 
Bibliographical footnotes. 
