86 



REPORTS ON INVESTIGATIONS AND PROJECTS. 



in each, and in every case there was an active oxidizing enzyme (tyrosinase) 

 which acted upon some unknown chromogen and produced the pigmentation. 

 It was found that the color-pattern in the elytra of the potato beetle is due to 

 the localized secretion of the oxidizable chromogen. 



STATISTICAL SUMMARY. 



Poultry. — There were maintained 52 breeding-pens and 2,214 chicks were 

 hatched. Further data were gathered on reciprocal crosses, sex control of 

 characters, syndactyl and polydactyl, nailless, combless, horned, rumpless, and 

 triple-combed strains. Selection experiments on plumage color were con- 

 tinued. 



Finches. — These showed a return to normal fecundity and 65 young were 

 reared from about 88 hatched. 



Sheep and Goats. — Twenty-nine sheep and 2 goats were born. Important 

 data on inheritance of the double-horned condition and on a new kind of 

 coat color were gained. 



Plants. — The range of species and number of individuals bred in Dr. 

 Shull's experiments are shown in the following table : 



STAFF. 



Miss Anne M. Lutz, who has been associated with our work from the 

 beginning, first as secretary and later as cytologist, resigned in February 

 and is continuing her studies on the cytological differences of the Oenotheras 

 in Belgium. A full report of her prolonged studies here has been nearly 

 completed. 



