334 THE AMERICAN NATURALIST [Vol. L 



rightly interpret them) fully establish the existence of 

 this third type of inheritance. Incidentally they indicate 

 that the Nilsson-Ehle principle of multiple determiners 

 to explain blending inheritance is quite superfluous. 



PAPEES CITED 



Castle, W. E. 



1906. The Origin of a Polydactylous Race of Guinea-pigs. Publ. 

 No. 49, Carnegie Inst, of Washington. 

 Castle, W. E., and Alexander Forbes. 



1906. Heredity of Hair-length in Guinea-pigs and Its Bearing on 

 the Theory of Pure Gametes. 16 id. 

 Hoshino, Yuzo. 



1915. On the Inheritance of the Flowering Time in Peas and Eice. 

 Jour. Col. Ag. TohoJcu Imp. Univ., Sapporo, Japan, 6, Pt. 9, 

 pp. 229-288. 



Marshall, F. R. 



1916. Corriedale Sheep. Journ. of Heredity, 7, pp. 88-95. 



