48 



SCIENCE 



[N. S. Vol. XLV. No. 1150 



and finger nail. Eight other plants of the 

 same age and all from the 1914 crop of seed 

 were treated similarly except that the finger 

 nail was moistened in macerated mosaic leaves 

 before pinching each leafiet to be inoculated. 

 Over three months have elapsed since the above 

 inoculations were made, but no signs of mosaic 

 have developed on any of the checks or on the 

 inoculated plants. On all the leaves, however, 

 the scars of the finger nail injury are visible. 



As the original mosaic plant has matured in 

 the meantime, leaving no fresh leaves to use 

 for inoculation, it seems advisable to present 

 this data so that others may be led to record 

 any observation they may make along this line. 

 J. A. McClintock 



Virginia Truck Experiment Station 



THE AMERICAN ASSOCIATION FOR 

 THE ADVANCEMENT OF SCIENCE 



SECTION C— CHEMISTRY— AT THE NEW YORK 

 MEETING 



On Wednesday, December 27, at Columbia 

 University, there was a joint session of Sec- 

 tions B and C, the American Chemical Society 

 and the American Physical Society, devoted 

 to a symposium on the structure of matter. 

 The attendance was very large, and Have- 

 meyer Hall was filled to capacity. The main 

 items on the program have already been 

 printed in a recent number of Science.'- 

 These papers^ and the subsequent discussion 

 brought out the fact that there is still a wide 

 divergence between the various views, partic- 

 ularly between those of the physicist and those 

 acceptable to the chemist; the mere fact of 

 such a divergence of view emphasizes the use- 

 fulness of this discussion — and, indeed, of fur- 

 ther discussion — of this very important topic. 



On Thursday, December 28, Section C met 

 with the American Chemical Society and the 

 Society of Chemical Industry at the College 

 of the City of New York, when the following 

 addresses were presented: 



Dr. William MePherson, retiring chairman of 

 Section C, professor of chemistry, Ohio State Uni- 



1 Vol. 44, p. 885, 1916. 



2 It will, we hope, prove feasible to have all of 

 these papers printed together in some suitable 



versity, ' ' Asymmetric Syntheses and their Bear- 

 ing upon the Doctrine of Vitalism." 



Dr. Phoebus A. Levene, EoekefeUer Institute for 

 Medical Eesearch, "The Individuality of Tissue 

 Elements. ' ' 



Dr. Hugh S. Taylor, Princeton University, ' ' The 

 Photo-Chemistry of the Chlorination Processes. ' ' 



Dr. George F. Kunz, New York City, ' ' Pre- 

 paredness Chemistry Exhibit of the United Chem- 

 ical Societies at the American Museum of Natural 

 History. ' ' 



Dr. C. G. Derick, Buffalo, "Equilibrium Con- 

 stants and Chemical Structure. ' ' 



Dr. S. Dushman, Schenectady, "Application of 

 Atomic Theories in Chemistry. ' ' 



Through the courtesy of the college, a com- 

 plimentary luncheon was tendered to the sec- 

 tion, which was highly appreciated. In the 

 afternoon the following papers were read: 



A Preliminary Eeport of the Chemical Com- 

 mittee of the National Eesearch Council, by Mars- 

 ton Taylor Bogert, chairman. 



"An Increase in the Sucrose Content of Sugar 

 Beets after their Removal from the Soil," by P. 

 G. Wieehmann. 



' ' Valency and Valence, " by M. L. Crossley.- 



"Conductivity Measurements on Oxidation-Re- 

 duction Reactions," by Graham Edgar. 



"Stability of PaTafBn Hydrocarbons," by G. 

 Egloff and R. J. Moore. 



The following by title only: 



"The Effect of Eineness of Division of Pulver- 

 ized Limestone upon Various Crop Yields," by N. 

 Kopeloff. 



"A Eelation between the Chemical Constitution 

 and the Optical Eotatory Power of the Phenylhy- 

 drazides of Certain Acids of the Sugar Group," 

 by C. S. Hudson. 



" (?-Mannoketoheptose. A New Sugar from the 

 Avocado," by P. B. La Forge. 



Section C elected new ofilcers, as follows: 



Vice-president and Chairman of the Section: 

 Professor W. A. Noyes, University of Illinois. 



Secretary: Professor James Kendall, Columbia 

 University. 



Member of Council: Professor M. A. Eosanoff, 

 Pittsburgh. 



Memter of General Committee : Dr. E. F. Bacon, 

 Pittsburgh. 



Member of Sectional Committee: Dr. Irving 

 Langmuir, Schenectady. John JOHNSTON, 



Secretary 



