900 



SCIENCE 



[N. S. Vol. XLII. No. 1095 



of other tree-grown mounds very similar in ap- 

 pearance to the one just excavated. Dr. 

 Fewkes hopes next year to find what is con- 

 cealed beneath. 



UNIVERSITY AND EDUCATIONAL NEWS 



The contest over the will of the late General 

 Brayton Ives, who left the bulk of his estate, 

 valued at more than $1,000,000, to Yale Uni- 

 versity, has been settled by the filing of an 

 order in surrogate's court. The contest was 

 begun by General Ives's three daughters. The 

 terms of the settlement were not divulged. 



The Duhring Memorial Building was for- 

 mally dedicated on December 13 by the trus- 

 tees of the University of Pennsylvania, and a 

 memorial tablet was imveiled at the entrance 

 to the new book stack. This new building is 

 a wing to the library, and was erected as a 

 memorial to the late Louis A. Duhring, pro- 

 fessor of dermatology at the University of 

 Pennsylvania, who left a legacy amounting to 

 more than a million dollars to the university. 

 The dedicatory addresses were made by Pro- 

 fessor Morris Jastrow, Jr., the university li- 

 brarian, and Dr. Joseph G. Eosengarten, chair- 

 man of the library committee of the board of 

 trustees. The building was accepted on be- 

 half of the university by Provost Edgar F. 

 Smith. 



A NEW building known as the Vivarium will 

 soon be completed at the University of Illinois. 

 It has been constructed especially for the work 

 of Dr. Charles Zeleny and Dr. V. E. Shelford, 

 of the department of zoology. The building, 

 with furnishings, will cost about $70,000. Sea- 

 water aquariums, a refrigerator system, and 

 rooms in which light rays may be used to the 

 exclusion of all others, are some of the things 

 which make up the equipment of the 

 Vivarium. 



Associate Professor H. P. Barss has been 

 promoted to be professor of botany and plant 

 pathology at the Oregon Agricultural College, 

 in place of Professor H. S. Jackson, who re- 

 cently resigned to accept the position of plant 

 pathologist at Purdue University. 



Dr. Albion Walter Hewlett, professor of 

 medicine at the University of Michigan, has 



accepted a similar appointment, beginning on 

 August 1, 1916, in the Medical School of 

 Stanford University. This fills the vacancy 

 left by the appointment of Dr. Ray Lyman 

 "Wilbur as president of the university. 



Assistant Professor A. L. Lovett has been 

 made acting head of the department of ento- 

 mology at the Oregon Agricultural College, in 

 place of Professor H. F. Wilson, who resigned 

 to accept a position as professor of entomology 

 at the University of Wisconsin. 



Count Hutten-Czapski, of Posen, has been 

 appointed curator of the Warsaw University 

 and Technical School, as reestablished under 

 German auspices. 



DISCUSSION AND COBBESPONDENCE 



THE TEACHING OF ELEMENTARY DYNAMICS 



To THE Editor of Science: Since I took a 

 hand, in Science of March 29, 1915, in the 

 controversy between Professors Huntington 

 and Hopkins concerning the fundamental 

 equation of dynamics, there have appeared 

 numerous communications on the subject 

 showing evidence of widespread interest in it. 

 As a result of these conmnmications, the ques- 

 tions at issue are now in a more chaotic state 

 than they ever were. The time now seems op- 

 portune for a review of the positions held by 

 the several contributors, in the hope that they 

 may yet be brought into agreement. I offer 

 here some brief extracts from letters that have 

 appeared in Science in the last six months, 

 with my comments upon them, together with 

 a condensed restatement of the problem I gave, 

 with my solution of it, in my previous article, 

 again asking that if any one thinks he has a 

 better solution he will present it for com- 

 parison. 



Uniformly Accelerated Motion 

 Prohlem. — A constant force, F pounds, acts 

 for T seconds on W pounds of matter, at rest 

 at the beginning of the time but free to move. 

 What are the results? Explain how the re- 

 sults are derived. 



Answer. — Experiments with the Atwood ma- 

 chine and other apparatus show (a) that the 

 velocity varies directly as the force and as the 

 time, and inversely as the quantity of matter; 



