74 



GORTNER, R. A. 



1917. The organic matter of the soil: III. On the production of humus 



from manures. Soil Science, v. 3, pp. 1-8. 

 GORTNER, R. A., and BLISH, M. J. 



1915. On the origin of the humin formed hy the acid hydrolysis of pro- 

 teins. /. Am. Chem. Soc., v. 37, pp. 1630-1636. 

 GORTNER, R. A., and HOLM, GEORGE E. 



1917. On the origin of the humin formed by the acid hydrolysis of pro- 

 teins III. Hydrolysis in the presence of aldehydes if. Hydroly- 

 sis in the presence of formaldehyde. /. Am. Chem. Soc., v. 39, 

 pp. 2477-2501. 

 GORTNER, R. A., and SHAW, WILLIAM M. 



1917. The organic matter of the soil : IV. Some data on humus phos- 

 phoric acid. Soil Science, v. 3, pp. 99-111. 

 GRANDEAU, Louis. 



1872. Recherches sur le role des matieres organiques du sol dans les phenom- 



enes de la nutrition des vegetaux. Compt. rend., t. 74, pp. 988-991. 

 GRANDEAU, Louis. 



1877. Traite d'Analyse des Matieres agricoles. 487 p., 46 tig. Paris. 

 GRINDLEY, H. S., and SLATER, M. E. 



1915. The quantitative determination of the amino-acids of feeding stuffs by 



the Van Slvke method. II. /. Am. Chem. Soc., v. 37, pp. 2762- 



2769. 

 GROUVEN, H. 



1883. Einer Abhandlung iiber die chemische Constitution der Moore. Fiih- 



lings Landw. Zeitung, p. 391. Abstracted in JaJircsbcr. Fort. Agr. 



Chem., N. S. Bd. 6, pp. 19-20. 

 HART, E. B. and SURE, BARNETT. 



1916. The influence of carbohydrates on the accuracy of Van Slyke method 



in the hydrolysis of casein. /. Biol. Chem., v. 28, pp. 241-249. 

 HAUSMANN, W. 



1899. Ueber die Vertheilung des Stickstoffs im Eiweissmolekiil. Z. physiol. 



Chem., Bd. 27, pp. 95-108. 

 HELMONT, JOHANN BAPTIST VAN. 



1648. Ortus medicinal vel opera et opuscula oninia. Cited in Friedrich 



Czapek's "Biochemie der Pflanzen." Bd. I. Jena 1913. 

 HENRIQUES, V. 



1909. Uber quantitative Bestimmung der Aminosanren in Harne. Z. physiol. 



Chem., Bd. 60, pp. 1-9. 

 HENRIQUES, V., and SORENSEN, S. P. L. 



1910. Uber die quantitative Bestimmung der Aminosauren, Polypeptide und 



der Hippursaure im Harne durch Formoltitration, II. Z. physiol. 



Chem., Bd. 64, pp. 120-143. 

 HILGARD, EUGENE W. 



1906. Soils, their Formation, Properties, Composition, and Relations to 



Climate and Plant Growth in the Humid and Arid Regions. 593 



p. The Macmillan Company, New York. 

 HLASIWETZ, H., and HABERMANN, J. 



1871. Ueber die Proteinstoffe. Erste Abhandlung. Ann. der Chem. und 



Pharm., Bd. 159, pp. 304-333. 

 HLASIWETZ, H., and HABERMANN, J. 



1873. Ueber die Proteinstoffe. Zweite Abhandlung. Ann. der Chem. und 



Pharm., Bd. 169, pp. 150-166. 



HOPPE-SEYLER, F. 



1909. Handbuch der physiologisch- und pathologisch-chemischen Analyse 

 fiir Aerzte und Studierende. 8th edition, 854 p. August Hirsch- 

 wald, Berlin. 

 JODIDI, S. L. 



1909. Organic nitrogenous compounds in peat soils. Mich. Agr. Exp. Sta. ( 



Tech. Bull. 4, 28 p. 

 JODIDI, S. L. 



1911. The chemical nature of the organic nitrogen in the soil. Iowa Agr. 



Exp. Sta., Research Bull. 1, 46 p., 1 fig. 



