96 REPORTS ON INVESTIGATIONS AND PROJECTS. 



hatched was 2,985 ; and more or less complete records were obtained also 

 from about 3,000 chicks that developed but did not hatch. All of these 

 have been described and the records tabulated to be used for immediate 

 publication of results or to be held awaiting further information. The 

 canary birds and finches have done well, 92 offspring having been reared. 

 The births of the year include 6 goats, 6 sheep, and 20 cats. An additional 

 step has been made toward the attainment of the particular combination 

 in one cat of the characteristics named in my last report. Work with 

 pigeons has been continued. 



The cytological investigations have continued under the charge of Miss 

 L,utz. Early in the year she was relieved of the work of secretary, which 

 threatened to absorb her entire time, so that now she devotes herself 

 wholly to investigation. She has gained results bearing on the infertility 

 in buckwheat when like flowers are bred together. 



COOPERATION WITH OTHER INVESTIGATORS. 



The number of investigators working experimentally on topics in evolu- 

 tion continues to grow. We have been visited by workers from different 

 parts of the country who have wished to inspect our work or consult on 

 particular points and we have profited by visits to consult with and exam- 

 ine the work of others. 



Our facilities have been extended to the following investigators who 

 are not on the staff of the Station : 



Dr. N. M. Stevens, of Bryn Mawr College, worked during the summer 

 upon the germ-cells of Coleoptera and continued her experimental work 

 on breeding plant-lice aphids. She was accompanied by Miss Alice M. 

 Boring, of Bryn Mawr College, who worked on the germ-cells of hemip- 

 terous insects belonging to the family Membracidse. 



Prof. W. J. Moenkhaus, of Indiana University, continued his work on 

 the breeding of flies to determine if the sex ratio can be modified by 

 selective breeding and if there is a reduction in fertility and vigor in suc- 

 cessive generations as a result of close in-breeding. 



Prof. H. E. Crampton, of Columbia University, continued at the Biolog- 

 ical Laboratory and the Station his work on selective breeding of the 

 large Saturnid moths. 



During the summer several of the investigators at the Biological 

 Laboratory made use of the library and other facilities of the Station. 



The following have been added to our correspondents : 



Dr. Francis Galton, F. R. S., the well-known student of human heredity, 

 to whom is due the introduction into biology of statistical methods. 



Dr. Alfred Giard, professor at the University of Paris and director of 

 the Laboratoire d'evolution des etres organisees. To Professor Giard is 

 due the conception in recent times of the establishment of an "Institut 



