868 



SCIENCE. 



[N. S. Vol. XV. No. 387. 



the location of the ore deposits of this and 

 neighboring districts and the border areas 

 of the Ozark uplift, as pointed out by Ha- 

 worth.* 



A fuller disciTSsion of the minerals noted in 

 this paper and their occurrence will be found 

 in the forthcoming 'Lead and Zinc Report 

 of the University Geological Survey of 

 Kansas.' 



Edmund O. Hovey, 



Secretary. 



THE ACADEMY OF SCIENCE OF ST. LOUIS. 



At the meeting of May 19, 1902, fifteen per- 

 sons were present. Professor C. M. Woodward 

 presented some notes on the 'Stresses in a 

 Rotating Disk,' from which it appeared that 

 the stresses in such a disk, as, for instance, 

 in an emery-wheel or grindstone, when mathe- 

 matically analyzed, are entirely tangential, 

 notwithstanding the fact that the disk in- 

 creases in diameter when rotated at a high 

 rate of speed, so that the tendency to frac- 

 ture is along radial lines. Professor Wood- 

 ward also discussed the stresses in the disk 

 when bound by a thin cylinder of greater 

 strength and a high modulus of elasticity. 



One person was elected to active member- 

 ship. 



William Trelease, 

 Recording Secretary. 



THE pacific coast ASSOCIATION OF CHEMISTRY 

 TEACHERS. 



The Association organized last summer, held 

 its first regular meeting as Berkeley, April 26, 

 The Association was started during the session 

 of the summer school of the University of Cali- 

 fornia by a few teachers who were in attend- 

 ance, and who realized the importance of a 

 better understanding among themselves as to 

 the proper methods of teaching chemistry. 

 During the first six months of its existence 

 a number of 'Circulars of Information' were 

 issued, and the membership steadily increased 

 until it now numbers about fifty. In April 

 the Association had become strong enough to 

 begin to hold meetings for the discussion of 

 subjects of interest to the members. The 



* Bull. Geol. Soc. Amer., 11: 221, 1900. 



first meeting was held in the chemistry build- 

 ing of the University of California and was 

 attended by representatives from the princi- 

 pal schools in that part of the state within 

 easy reach of Berkeley. Two subjects had 

 been assigned for discussion, both dealing 

 with the proportion of work that should be 

 done by the teacher and the student respect- 

 ively. But the discussion took a wider 

 range and covered the entire subject before 

 the meeting adjourned. While there was con- 

 siderable difference of opinion as to methods, 

 it was the unanimous opinion of those present 

 that it is necessary to emphasize the practical, 

 everyday side of chemistry to make it inter- 

 esting and attractive to the beginner. 



The Association is planning to hold its 

 annual meeting in July during the summer 

 school at the University, when teachers from 

 all parts of California and the other Pacific 

 states gather at Berkeley in large numbers. 

 Edward Booth, 

 Secretary. 



University of California. 



DISCUSSION AND GORBESPONDENCE. 



THE COMING MEETING OP THE AMERICAN ASSOCIA- 

 TION FOE THE ADVANCEMENT OF SCIENCE. 



Unfortunately the list of officers of the 

 coming meeting of the American Association 

 in Pittsburgh was dropped by the printer from 

 the paged proofs of the Preliminary Circular, 

 and the omission was not detected until the 

 entire edition had been printed and mailed. 

 That there may be no misunderstanding the 

 list of officers for this meeting is herewith 

 given : 



OFFICERS OF THE PITTSBURGH MEETING. 



President. 



Asaph Hall, U. S. N., South Norfolk, Conn. 

 Vice-Presidents. 



A — ^Mathematics and Astronomy, G. W. Hough, 

 Northwestern University. 



B — Physios, W. S. Franklin, Lehigh University. 



C — Chemistry, H. A. Weber, Ohio State Univer- 

 sity. 



D — Mechanical Science and Engineering, J. J. 

 Flather, University of Minnesota. 



E — Geology and Geography, 0. A. Derby, Sao 

 Paulo, Brazil. 



