Germination of Forest Trees 89 



upon the After-ripening of the Seeds of Crataegus mollis. Bot. 

 Gaz., 54, 1912. 



17. Eckerson, S. A Physiological and Chemical Study of After-ripening. 



Bot. Gaz., 55, 1913. 



18. Shull, C. A. The Role of Oxygen in Germination. Bot. Gaz., 57, 



1914. 



19. Atwood, W. M. A Physiological Study of the Germination of Avena 



fatua. Bot. Gaz., 57, 1914. 



20. Crocker, W., and Davis, W. E. Delayed Germination in Alisma plan- 



tago. Bot. Gaz., 58, 1914. 



21. Crocker, W. The Role of Seed Coats in Delayed Germination. Bot. 



Gaz., 42, 1906. 



22. Amerikanische Versuche mit Kiefersamen. Zeitschrift fiir Forst- und 



Jagd-wesen, April, 1908. 



23. Schotte, G. Work of the Swedish Forest Experiment Station. Re- 



view in Forestry Quarterly, IV.: 51, 1906. 



24. Die Zuchtwahl im Forstbetriebe und die Bestandespflege. Allg. Forst- 



und Jagd-zeitung, December, 1907. 



25. Busse, J. Ein Weg zur verbesserung unseres Kiefernsaatgutes. Zeit. 



schrift fiir Forst- und Jagd-wesen, May, 1913. 



26. Centgraf, A. tJber Beziehungen zwischen Tausendkorngewicht und 



Keimenergy bei Kiefersamen. Allg. Forst- und Jagd-zeitung, June, 



I9I3- 



27. Schlich, W. A Manual of Forestry. Vol. II, London, 1891. 



28. Duggar, B. M. Plant Physiology. New York, 191 1. 



29. Waldron, L. R. A Suggestion Regarding Heavy and Light Seed 



Grains. Am. Nat., 44, 1910. 



30. Webber, H. J., and Boykin, E. B. The Advantages of Planting Heavy 



Cotton Seed. U. S. Dept. Agric, Farm Bui. 285, 1907. 



31. Shamel, A. D. The Improvement of Tobacco by Breeding and Selec- 



tion. U. S. Dept. Agric. Yearbook, 1904. 



32. Trabut, L. Bulletin 17, Service Botanique de l'Algerie. Directeur 



du Service Botanique, Governement de l'Algerie. 



33. Harris, J. A. On Differential Mortality with Respect to Seed Weight 



Occurring in Field Cultures of Phascolus vulgaris. Am. Nat, 46, 

 1912. 



34. Harris, J. A. Supplementary Studies in the Differential Mortality 



with Respect to Seed Weight in Germinating Garden Beans. Am. 

 Nat, 47, 1913. 



35. Harris, J. A. On Differential Mortality with Respect to Seed Weight 



Occurring in Field Cultures of Pisum sativum. Am. Nat, 48, 1914. 



36. Nobbe, F. Handbuch der Samenkunde. 1876. 



37. Walls, E. P. The Influence of the Size of the Grain and the Germ of 



Corn upon the Plant. Bui. 106, Md. Agric. Exp. Sta., 1905. 



38. Cummings, M. B. Large Seed a Factor in Plant Production. Bui. Vt. 



Agric. Exp. Sta., 177, 1914. 



