LITERATURE CITATIONS 313 



1914. Potato wilt, leaf roll, and related diseases. U. S. Dept. Agr., 



Bull. 64, 48 pp. 

 PAMMEL, L H., 1892. On the crossing of cucurbits. Iowa Agr. Exp. 



Sta., Bull. 19: 595-600. 

 PARKER, JOHN H., 1918. Greenhouse experiments on the rust resistance of 



oat varieties. U. S. Dept. Agr., Bull. 629, 1-16. 



1920. A preliminary study of the inheritance of rust resistance in oats. 



Jour. Am. Soc. Agron., 12 : 23-38. 

 PARKER, W. H., 1914. Lax and dense-eared wheats. Jour. Agr. Sci., 6 : 



371-386. 



PARNELL, F. R., AYYANGAR, G. N. R., and RAMIAH, K., 1917. The inheri- 

 tance of characters in rice. 1. Mem. Dept. Agr. India, Bot. Ser., 9: 



75-105. 

 PEARL, RAYMOND, 1915. Modes of research in genetics. The Macmillan 



Co., New York. 

 PEARL R., and MINER, J. R., 1914. A table for estimating the probable 



significance of statistical constants. Maine Agr. Exp. Sta., Bull. 226: 



85-88. 

 PIPER, C. V., 1912. Agricultural varieties of the cowpea and immediately 



related species. U. S. Dept. Agr., Bur. Plant Indust., Bull. 229: 1-160. 



1916. Forage plants and their culture. The Macmillan Co., 



New York, 618 pp. 

 PIPER, C. V. EVANS, M. W., McKEE, R., and MORSE, W. J., 191. Alfalfa 



seed production; pollination studies. U. S. Dept. Agr., Bull. 75, 32 pp. 

 PIPER, C. V. and MORSE, W. J., 1910. The soybean: History, varieties and 



field studies. U. S. Dept. Agr., Bur. Plant Indust., Bull. 197, 84 pp. 

 POWELL, G. H., 1898. Plant breeding. Am. Gard., 16: 466-467, 



514-515. 



PRICE, H. L., and DRINKARD, A. W., JR., 1908. Inheritance in tomato hy- 

 brids. Virginia Agr. Exp. Sta., Bull. 177: 18-53. 



1911-12. Inheritance in cabbage hybrids. Ann. Rept. Virginia 



Polytec. Inst. Agr. Exp. Sta. for 1911 and 1912 : 240-257. 

 PRIDHAM, J. T., 1916. Oat breeding experiments. Agr. Gaz. N. S. 



Wales, 27:457-461. 

 QUANJER, H. M., 1920. The mosaic disease of the Solanacese, its relation to 



the phloem-necrosis and its effect upon potato culture. Phytopath., 



10 : 35-47. 

 REEVES, F. S., 1918. Report of Hort. Exp. Sta., Vineland, Ontario, 



for 1916-17:39-41. 

 RIOLLE, Y. T., 1914. Recherches morphologiques et biologiques sur les 



Radies cultives. Ann. Sci. Agron., 31st year: 346-550. 

 ROBERTS, HERBERT F., 1919. The founders of the art of breeding. 



Jour. Heredity, 10: 99-106, 147-152, 229-239, 257-275. 



1919. The contribution of Carl Friedrich von Gartner to the history of 



plant hybridization. Am. Nat., 53 : 431-445. 

 RUMKER, K. VON, 1913. Ueber Roggenzuchtung. Btr. zur Pflanzen- 



ziicht., 3 : 8-28. 



RUMKER, K. VON, and LEIDNER, R., 1914. Ein Beitrag zur Frage der 

 Inzucht bei Roggen. Zeitschr. fur Pflanzenziicht., 2 : 427-444. 



