ZOOLOGY. 383 



fessor Harvey Carr, of the University of Chicago, are nearing comple- 

 tion and will soon be submitted for publication. 



The Whitman pigeon collection has been transferred from Chicago 

 to the Station for Experimental Evolution at Cold Spring Harbor. 

 In numbers and in species the collection is hardly as strong as formerly, 

 though in some respects it has been strengthened and is at present 

 in very favorable condition. 



New studies on a comparison of the amount of stored energy in the 

 male and female producing yolks have been carried on with the bomb 

 calorimeter during the present year. The results fully confirm earlier 

 and simultaneous conclusions reached upon the basis of numerous 

 chemical analyses. Male-producing ova store less energy than do 

 female producing ova. 



All of the previously reported lines of investigation on sex and sex 

 control in pigeons have been continued on an increased number of 

 individuals and the earlier results have been extended and confirmed. 

 All these investigations will be continued for another year. Through- 

 out the present year the sex-dimorphism of the ova has been followed in 

 113 females; these individuals representing 2 families, 4 genera, 10 

 species, and 8 kinds of hybrids. Many of these individuals have been 

 continuously studied since 1911. The results conclusively show that 

 doves produce two kinds of eggs — different in size and in their relative 

 tendency to produce male and female. The studies on the sex behavior 

 of doves from a sex-controlled series, and on the modification of this 

 by the injection of germinal extracts, have now furnished the most 

 striking and convincing evidence, not only of the reality of sex-control, 

 but of the quantitative nature and basis of sex itself. 



Naples Zoological Station, Naples, Italy. Maintenance of two tables for 

 American biologists. (For previous reports see Year Books Nos. 2-12.) 



During the last term the two tables of the Carnegie Institution of 

 Washington were occupied by Professor Edwin C. Starks, of Stanford 

 Universit}^, California, from January 13 to March 7, 1914, and by Miss 

 Mathilde Lange, Leipzig, from February 2 to June 13, 1914. 



Dr. Starks was engaged in continuing his studies on the osteology and 

 myology of various little-known Acanthopterygians. 



Miss Lange worked on the regenerative power of Cephalopods and 

 was supplied with abundant material. She investigated particularly 

 Octopus, Eledone, and Sepia (young and adult). The studies referred 

 pa^'ticularly to the regeneration of the arms, but she obtained also 

 some results on the regenerative capacity of the eye. The regenerated 

 organs were preserved, but their histological investigation was only 

 partly done in the laboratories of the Zoological Station. 



