Decembeb 2, 1910] 



SCIENCE 



797 



ing Rhus in Canada. His illustration looks 

 exactly like our gall, except that it is larger, 

 but the figure has probably been enlarged. 

 At the bottom of the plate it is stated to be on 

 Bhus cotinus, but on page 90 it is assigned to 

 R. typhina, which is much more likely. 



Eriophyes rhois Stebbins, from Massachu- 

 setts, forms a quite dift'erent gall on Toxico- 

 dendron toxicodendron (Rhus toxicodendron 

 Linn.). 



T. D. A. COCKERELL 

 UjStlVEKSITT OF COLORADO 



V SEX-LIMITED rSHEEITANCE 



To THE Editor op Science: In view of the 

 recent interest in the question of the relation 

 of sex to the barring factor in poultry, an 

 hypothesis for which was presented by Spill- 

 man' in 1908, and the demonstration of which 

 has been brought forward by Goodale" and by 

 Pearl and Surface' and others, the following 

 reference to a breeding experiment carried out 

 by Samuel Cushman at the Rhode Island 

 Agricultural Experiment Station in 1892 may 

 be pertinent at this time. 



Cushman made a large number of crosses 

 between pure-bred fowls with the purpose of 

 perfecting a good market roaster and capon. 

 Among his crosses were the following: 



Indian Game X Light Brahma. 



Indian Game X Houdan. 



Indian Game X Golden Wyandotte. 



Indian Game X Buff Cochin. 



White Wyandotte X Light Brahma. 



White Wyandotte X Indian Game. 



Houdan X Partridge Cochin. 



Silver Gray Dorking X Dark Brahma. 



Silver Dorking Game X Dorking. 



Plymouth Rock X Bufif Cochin. 



Indian Game X Plymouth Rock. 



In Cushman's published results' he gives a 

 brief description of the progeny resulting 

 from these crosses and, regarding the Indian 

 Game X Plymouth Rock cross, states that 



'Am. Nat., 1908, XLII., 50. 

 'Science, N. S., 1909, XXIX., 756. Proc. Sac. 

 Exper. Biol, and Med., 1910, 7. 5. 



'Maine Agric. Expt. Station Bulletin 177, 1910. 

 'Ohio Poultry Journal, 1S93, II., 7, 185-191. 



the cockerels were between Indian Game and 

 Plymouth Rock in shape; that the combs re- 

 sembled those of the Indian Games, and that 

 the plumage was like that of the Plymouth 

 Rocks. He states further that the pullets 

 were all black and more lil<e the Indian Game 

 in shape. This is the clear statement of the 

 observed facts of a case of sex-limited in- 

 heritance. 



Philip B. Hadley 

 R. I. Agricultubax Expeeiment Station, 

 Kingston, R. I., 

 October 18, 1910 



correspondence in regard to the length of 

 service pension.s of the c.\rnegie foundation 

 Garrison-on-Hddson, N. T., 



November 8, 1910 

 President Charles E. Thwing, LL.D., 



Secretary of the Board of Trustees 

 of the Carnegie Foundation for 

 the Advancement of Teaching. 



Sir: In the fourth annual report of the 

 Carnegie Eoundation for the Advancement of 

 Teaching, the action of the trustees in connec- 

 tion with the withdrawal of the retiring al- 

 lowances for length of service is reported by 

 j'ou as follows: 



The rules as thus amended provide a retiring 

 allowance for a teacher on two distinct grounds: 

 ( 1 ) to a teacher of specified service on reaching 

 the age of sixty- five; (2) to a teacher after 

 twenty-five years of service in case of physical 

 disability. 



Although these are the general rules governing 

 retirement, the trustees are nevertheless willing 

 to grant a retiring allowance after the years of 

 service set forth in Rule 1 [Rule 2?] to the rare 

 professor whose proved ability for research prom- 

 ises a fruitful contribution to the advancement 

 of knowledge if he were able to devote his entire 

 time to study or research; and the trustees may 

 also grant a retiring allowance after the years of 

 service set forth in Rule 1 [sic] to the executive 

 head of an institution who has displayed distin- 

 guished ability as a teacher and educational ad- 

 ministrator. 



President Jordan has printed in the N. Y. 

 Evening Post the resolutions adopted by the 

 trustees as follows : 



It was also on motion, duly made and seconded. 



