120 



SCIENCE 



[N. S. Vol. LI. No. 1309 



necessarily mamerous on tlie floor of an open 

 woods like our Arboretum. The necessity 

 therefore of protecting the superficial parts 

 of the root system, even of a deep-rooted tree 

 like blue gum is perfectly obvious from the 

 foregoing description. 



One more conclusion can be drawn from 

 these observations. The Monterey cypress 

 above referred to, was growing at no great dis- 

 tance from the eucalyptus trees but was in no 

 wise impoverished by its more rapidly grow- 

 ing neighbor. There is a general impression, 

 based no doubt on a certain amount of 

 accurate observation, that the eucalyptus is a 

 bad neighbor and that trees, shrubs, and 

 herbaceous plants set too close to eucalyptus 

 trees will suffer for lack of water. The above 

 observation shows that if the plants set near 

 eucalyptus have the habit of sending their 

 roots lower than the superficial part of the 

 root system of the eucalyptus, such results 

 will not foUow. 



Therefore, it would seem to be possible, not- 

 withstanding general belief to the contrary, 

 to plant trees and shrubs fairly close to euca- 

 lyptus providing they can get along with the 

 amount of light which the growing eucalyptus 

 will keep from reaching the surface of the 

 soil. This may make possible the fuller 

 utilization of areas of soil already carrying a 

 certain niunber of eucaljrptus trees. 



James McMuephy, 

 George J. Peerce 



STA^fP0RD University, 

 November 1, 1919 



THE MATHEMATICAL ASSOCIATION 

 OF AMERICA 



The fouitli annual meeting of the assooia.tion 

 was held at Columbia University on Thursday and 

 Friday, January 1 and 2, 1920. A joint dinner 

 with the American Mathematical Society occurred 

 on Wednesday evening. About 150 were in at- 

 tendance at the various sessions. 



The general topic for all sessions was "Mathe- 

 matics in Relation to the Allied Sciences." The 

 program was as follows: 



"Mathematics for the physiologist and physi- 

 cian," Dr. HoraAio B. Williams, assistant pro- 

 fessor of physiology, College of Physicians and 

 Surgeons. 



"The regular solids and tihe types of crystal 

 symmetry," Dr. Paul L. Saurel, professor of 

 mathematics, College of the City of New York. 



' ' The mathematics of physical chemistry, ' ' Pro- 

 fessor George B. Pegram, dean of the school of 

 mines, engineering and chemistry, Columbia Uni- 

 versity. 



"The mathematics of biometry," Dr. Lowell 

 J. Beed, associate professor of biometry and vital 

 statistics, Johns Hopkins University. 



"An experiment in the conduct of freshman 

 mathematics courses," Dr. F. B. Weley, professor 

 of mathematics, Denison University. 



Preliminary report of the National Committee 

 of Mathematical Requirements, Dr. John. W. 

 Young, professor of mathematics, Dartmouth Col- 

 lege. 



"Mathematics for students of physics," Dr. 

 Leigh Page, assistant professor of physics, Yale 

 University. 



At the business meeting the election to member- 

 ship by the council of 73 persons and two institu- 

 tions was announced. The treasurer's report 

 sihowed receipts of $4,728 on 1919 business, ex- 

 penditures (up to December 15, 1919) of $4,317, 

 and an estimated final balance of $2,050 for the 

 end of the year 1919. 



The result of the election of ofiicers was as fol- 

 lows: 



President: David Eugene Smith, Columbia Uni- 

 versity. 



Vice-presidents: Helen A. Merrill, WeUesley 

 College, and E. J. Wilczynski, University of Chi- 

 cago. 



Additional memiers of tlie Council (to serve 

 until January, 1923) : R. D. Carmichael, Univer- 

 sity of Illinois; E. R. Hedrick, University of Mis- 

 souri; H. E. Slaught, University of Chicago, and 

 J. W. Young, Dartmouth College. 



To fill the vacancies caused by the election of 

 Professor Wilczynski to a vice-presidency and the 

 reappointment of Professor Slaught as manager 

 of the Monthly, the council appointed as members 

 of the council E. L. Dodd, University of Texafl, 

 and Oswald Veblen, Princeton University. 



SCIENCE 



A Weekly Journal devoted to the Advancement of 

 Science, publishing the official notices and pro- 

 ceedings of the American Association for 

 the Advancement of Science 



Published every Friday by 



THE SCIENCE PRESS 



LANCASTER. PA. GARRISON, N. Y. 



NEW YORK, N. Y. 



Entered in the poet-office at Lancuttr, Pa., at lecond clan matter 



