24 Journal of the Mitchell Society [September 



AV. J. Matherly: Chemistry— J. A. Bender. C. K. Brooks, F. C. Coch- 

 ran, E. W. Constal)le, 11. D. C'roekford. E. D. Jennings. J. L. McEwen, 

 E. 0. Moehlmann, J. L. Moiirane, L. V. Phillips, H. G. Pickett, W. B. 

 Smoot ; Civil Engineering — J. P. Clawson, L. W. Fischel, N. P. Hayes, 



E. M. Knox, 0. E. Martin. L. J. Phipps. J. W. Taylor, J. S. Wearn ; 

 Electrical Engineering — G. T. Finger, J. L. Pressley, R. A. Tillmann, 

 R. M. Wearn, D. A. Wells ; Geology— E. J. Alexander, H. H. Bullock, 

 R. E. L. Carson. C. W. Fowler. 11. C. Harris, T. G. Miirdock ; Mathe- 

 matics — J. N. Brand, W. V. Parker; Merlicine — Howard A. Patterson; 

 Pharmacy — E. B. Bristow, J. E. Campbell. W. A. Pront ; Physics — 

 Wade Gardner, C. G. Maimey; Psychology — W. D. Glenn. John H. 

 McFadden ; Zoology— \Y. L. Smith. 



251st Meeting — November 8, 1921 



F. P. Venable — Isotopes. 



The growth of the idea that the atoms of the elements might he 

 dissimilar as to their relative weight was traced through the work 

 of Crookes and others and the revelations of radio-activity ; the neces- 

 sity for assigning a number of elements to the same position in the 

 Periodic Table was pointed — hence the need of a new designation, 

 namely, isotopes. The physical demonstration of the existence of 

 isotopes, the determination of their atomic weight and the relative 

 proportions in which they occurred Avere described, and the close 

 agreement with accepted atomic weights noted. The paper appeared 

 ill full in this Journal, Vol. 87. p. 115. 



W. C. CoKER — A Visit to Lapland and to Some Old Herbaria. 



The past summer was spent in Europe in the study of fungi in sev- 

 eral of the most important herbaria. About a month was spent (two 

 weeks at first and two weeks later) at Kew Gardens, England, in the 

 use of the fine library, and in looking over plants sent by our Dr. 

 M. A. Curtis to Rev. M. J. Berkeley. Another month, with the ex- 

 ception of a short trip to Lapland, was spent in Stockholm, Sweden, 

 with daily trips by tram to the massive new Riks ]\Iuseum, where 

 are to be found several fine collections of fungi, notable among them 

 being those of the Sydows and that of Bresadola, the latter recently 

 bought by the well-known mycologist Lars Romell, a i^atent laAvycr 

 by profession and a devoted scientist by instinct, who has deposited 



