Mosaics and Gynandromorphs. 



171 



to cardia in one. The most pronounced ulcers, reaching down to 

 the serosa, were obtained at the fundus of the tenth rabbit after 

 extirpation of 2/3 of the right adrenal and five days later of the left. 



In fourteen normal rabbits no lesions in the stomach or in the 

 duodenum were seen. 



Extirpation of left adrenal and right lobe of thyroid in one 

 rabbit and right adrenal and left lobe of thyroid in another (in one 

 sitting). Stomach and duodenum normal. 



It is said that gastric lesions may be present in rabbits from 

 infection. The latter two were the only ones who became infected 

 and yet no lesions in the stomach were seen. 



A full report of our work will be published in the near future. 



References. 



1. Friedman, G. A. A Hitherto Undescribed Form of Polycythemia and Its 



Possible Relation to Duodenal Ulcers, Chronic Pancreatitis, and a Distur- 

 bance of Internal Secretion (Epinephrin). Med. Rec, October, 18, 1913, Vol. 

 84, p. 701. 



2. Weitere Erfahrungen iiber Polyzythaemie beimchromschen uncompliziertem 



Duodenal geschniir. Arch. f. Verdauungskrankheiten, Bd. XIX, Ergaenzungs- 

 heft, p. 175, I9I3- 



3. The Value of Polycythemia for the Diagnosis of Duodenal Ulcer, Based 



upon Sixteen Operatively Demonstrated Cases. Med. Record, May 16, 1914, 

 Vol. 85, p. 875- 



105 (922) 



Mosaics and gynandromorphs in Drosophila. 

 By T. H. Morgan. 



[From the Zoological Laboratory, Columbia University.] 



Quite a number of gynandromorphs and mosaics have appeared 

 in our experiments with the mutant stocks of Drosophila. In some 

 of these the male side or part is maternal, and in others paternal, 

 and in one case both paternal and maternal. For the first type 

 Boveri's hypothesis of partial fertilization will cover the result, 

 for the second my own hypothesis of polysperm will explain the 

 facts. In the third case the result must be due to mitotic dis- 

 location at some early cleavage stage. 



In order to test these three hypotheses, I crossed a female 

 homozygous for the sex-linked characters, yellow body color and 



