428 BIOLOGY: GENERAL AND MEDICAL 



produced a surprising hybrid which grew into a large 

 tree upon which appeared large numbers of the usual 

 yellow racemes of Cytisus vulgare, large numbers of 

 reddish racemes of equal size, and, what was most pecu- 

 liar, distributed over the tree like gay parasites, there 

 were groups of small boughs upon which were numbers 

 of the small purple racemes of Cytisus purpureus. 

 Presumably such an effect could only be brought about 

 through a partial fusion of the protoplasts of stock and 

 graft in the callus formed during the healing of the 

 graft wound. Interesting graft-hybrids have also been 

 produced by Winkler. 



REFERENCES. 



THOMAS H. MORGAN: "Regeneration," N. Y., 1901. 



C. C. GUTHRIB: " Heterotransplantation of Blood Vessels and 



Other Studies." Dissertation, Chicago, 1907. "Science," 



xxiv, July, 1909. 

 G. BORN: "Ueber Verwachsungsversuche mit Amphibien- 



larven." Archiv. f . Entwickelungsmechanik der Organis- 



men, 1897, iv., 349. 

 ALEXIS CARREL: "Transplantation in Mass of the Kidneys." 



Journal of Medical Research, 1908, x., 98. 

 ALEXIS CARREL: "Results of the Transplantation of Blood 



Vessels, Organs, and Limbs." Jour. Amer. Med. Asso., 



li., No. 20, Nov. 14, 1908, p. 1662. 

 C. C. GUTHRIE: "Survival of Engrafted Tissues." Jour. Amer. 



Med. Asso., March 12, 1910, liv, No. 11, p. 831. 

 C. C. GUTHRIE: Survival of Engrafted Tissues: Ovaries and 



Testicles." Jour, of Experimental Medicine, 1910, xii., 



269. 



