302 



SCIENCE 



[N. S. Vol. XXXVIII. No. 974 



ates of all departments of the university. All 

 of the engineering courses maintained by the 

 state, with the exception of the course in 

 mining engineering in the School of Mines at 

 Butte, will be concentrated in the college at 

 Bozeman. Dean A. W. Richter was trans- 

 ferred to Bozeman and becomes dean of engi- 

 neering. Assistant Professors Wm. R. Plew 

 and Philip S. Biegler were also transferred 

 and added to the faculties of civil and elec- 

 trical engineering, respectively. 



Dr. Andrew Howard Ryan, for three years 

 past instructor in physiology and pharmacol- 

 ogy in the University of Pittsburgh, has ac- 

 cepted the chair of physiology in the medical 

 department of the University of Alabama. He 

 succeeds Dr. John Van de Erve, who recently 

 resigned to take the chair of physiology in 

 Marquette University, Milwaukee. Other ap- 

 pointments in the University of Alabama are : 

 Dr. Howard H. Bell, of the University of 

 Pennsylvania, full time assistant in the de- 

 partment of pathology; Dr. Jesse P. Chap- 

 man, instructor in orthopedic surgery; Dr. 

 Percy J. Howard, associate professor of sur- 

 gery; Dr. E. S. Sledge, instructor in radiog- 

 raphy, and Dr. Julius G. Henry, instructor in 

 medicine. 



Dr. Wade H. Brown, professor of pathology 

 in the University of North Carolina, Chapel 

 Hill, has resigned, to accept service with the 

 Rockefeller Institute of Medical Research, 

 New York City, and has been succeeded by 

 Dr. James A. Bullitt, late of the University 

 of Mississippi. 



Dr. Albert Einstein, docent for mathemat- 

 ical physics at the Zurich Technological Insti- 

 tute, known for his eontribiitions to the theory 

 of relativity, has been called to Berlin to suc- 

 ceed the late Professor J. H. van't Hoff. 



DISCUSSION AND COBBESFONDENCE 

 color correlation in cowpeas 



Some facts developed in my genetic investi- 

 gations with cowpeas (Vigna species) are of 

 interest in connection with the remarks of 

 Professor J. K. Shaw, on page 126, concerning 

 color correlation in garden beans. There are 



some interesting similarities and also inter- 

 esting diilerences in these correlations as I 

 have found them in the eowpea and as Pro- 

 fessor Shaw finds them in the bean. I have, 

 in most of the cases considered below, deter- 

 mined the particular Mendelian factor con- 

 cerned in the correlation. 



All varieties of cowpeas having coffee-col- 

 ored seeds and all varieties having white or 

 cream-colored seeds have white flowers and are 

 devoid of anthocyan in stems and leaves. The 

 flower color, which is due to an anthocyan, 

 and the anthocyan in steins and leaves are 

 dependent on two Mendelian color factors, one 

 of which, apparently an enzyme, is the general 

 factor for color in the seed coat of the eowpea. 

 The other is the special factor for black 

 which, when added to a variety having coffee- 

 colored seeds, converts the seed color to black. 



I have found three independent Mendelian 

 factors for " eye " in the eowpea which, singly 

 and together, give five distinct types of " eye." 

 One of these factors, which gives the type of 

 " eye " which I have designated the narrow 

 " eye," also has the effect of inhibiting the 

 development of anthocyan in the flowers, 

 though it permits its development in stems 

 and leaves. That is, the variety having the 

 narrow " eye " has white flowers but has the 

 pinkish-red or purplish color in certain por- 

 tions of the stems and leaves. We apparently 

 have here certain Mendelian factors which act 

 differently in different parts of the plant, and 

 this seems to be responsible for the correlation 

 of the characters here discussed. 



Cowpeas having any part of the seed coat 

 black have anthocyan in the stems and leaves, 

 and unless the factor for narrow " eye " is 

 present there is also anthocyan in the flowers. 

 Covirpea varieties having coffee-colored seeds 

 have no anthocyan in stems, leaves or flowers. 

 Cowpeas having buff or red seed coats may or 

 may not have anthocyan in the stems and 

 leaves and in the flowers according as the 

 special factor for black or the factor for nar- 

 row " eye " is present or absent. 



W. J. Spillman 



U. S. Depabtment op Ageicultuee 



