November 11, 1921] 



SCIENCE 



463 



treatment, $1; medicine, laboratory tests, x- 

 ray photographs and other supplies at cost; 

 diagnosis of cases requiring special examina- 

 .tions and study, with group consultation of 

 specialists and diagnosis, $10 ; thorovigh health 

 examination to discover possible defects from 

 diseases and to obtain advice regarding per- 

 sonal hygiene, $2.50. 



The next meeting of the International Geo- 

 detic and Geophysical Union and of its various 

 sections will be at Eome in 1922. 



UNIVERSITY AND EDUCATIONAL 

 NEWS 



Under the terms of the will of the late 

 Hiram Francis Mills, A.M. (Hon.) '89, of 

 Hingham, $200,000 has been left to Harvard 

 University for the study of the origin and 

 cure of cancer. The fund is to be known as 

 the Elizabeth Worcester Mills Fund in honor 

 of Mr. Mills's wife. 



On account of the increased enrollment in 

 psychology courses in Purdue University, two 

 additional instructors and an assistant have 

 been appointed. The new instructors are: 

 H. C. Townley, A.M. (Wisconsin '21), Peter 

 McCoy, A.M. (Columbia '14), and Dorothy 

 Lee, A.B. (Indiana '21). The present enroll- 

 ment in general and vocational psychology is 

 approximately 500, of whom 345 are men. 

 Changes in the engineering curricula at Pur- 

 due make it possible for an engineering stu- 

 dent to take two full years of work in psy- 

 chology. 



At the University of Pennsylvania in the 

 Medical School, Dr. Glen E. Cullen has been 

 made an associate professor of research medi- 

 cine. Dr. W. A. Jaquette has been made pro- 

 fessor of oral surgery and director of the 

 school of dental hygienists, and Dr. Samuel 

 Goldschmidt has been made assistant profes- 

 sor of physiology. 



Three associate professors in the TovTne 

 Scientific School have been promoted to full 

 professorships in chemistry. They are Dr. 

 John Frazer, Dean of the Towne Scientific 

 School; Dr. Thomas P. McCutcheon and Dr. 

 Hiram S. Lukens. The trustees have also 



elected Dr. George A. Piersol emeritus pro- 

 fessor of anatomy. Dr. Piersol retired from 

 the professorship of anatomy last spring. 



Welton J. Crook has resigned as chief 

 metallurgist to the Pacific Coast Steel Co. 

 to accept an appointment as associate profes- 

 sor of metallurgy in Stanford University. 



Miss Emma Francis, who resigned as head 

 of the nutrition laboratory. Battle Creek San- 

 itarium, last July, has been appointed assis- 

 tant professor of chemical agriculture in the 

 Experiment Station of Pennsylvania State 

 College. 



Kenneth H. Donaldson has been appointed 

 instructor in ore dressing and mining at the 

 Case School of Applied Science. 



Professor F. E. Guyton, of the Ohio State 

 University, has been appointed assistant pro- 

 fessor of zoology and entomology at the Ala- 

 bama Polyteclmic Institute. 



E. Eugene Barker has returned from Porto 

 Eico and has accepted a position as associate 

 professor of botany at the University of 

 Georgia. 



J. J. O'Neil has been appointed acting as- 

 sistant professor of geology at McGill Uni- 

 versity during the absence of J. A. Bancroft. 



DISCUSSION AND CORRESPONDENCE 



AN EXPLANATION OF LIESEGANG'S RINGS 



To THE Editor of Science: Dr. McGuigan 

 seems to be unaware of much recent woi-k on 

 banded precipitates (Science, July 22). He 

 has come to the conclusion, generally, that 

 in some way, the chromate is attracted from 

 the regions of the gel adjacent to the precipi- 

 tate. So far this is in accordance with the 

 theory proposed by myself in 1916 and con- 

 firmed by a long series of experiments."^ But 

 Dr. McGuigan's particular hypothesis will 

 not bear examination in detail. He may be 

 right in supposing the attractive force to be 

 that between the silver and chromate ions. 

 But this is not sufficient to explain why the 

 bands form in gelatin and not in agar. 

 E'either is the assumption tenable that the 



1 Bioehem. J., 1916, X., 169; 1917, XI., 14; 1920, 

 XIV., 29, 474. 



