20 



.Dr. Michael Levine next gave a short talk entitled "Studies 

 in Plant Cancers." 



Crown gall was produced in Bryophyllum leaves by inocula- 

 tions of the buds in the notches of the leaves with Bacterium 

 tumejaciens. On 48 leaves thus inoculated, 199 globular crown 

 galls were formed and only 31 crown galls showed leafy shoots; 

 that is, one crown gall with leafy shoots developed to every eight 

 crown galls of the globular type. Twelve uninoculated leaves 

 growing under conditions which favored the development of 

 the marginal buds, produced 106 shoots on these leaves. A 

 short report on this subject appears in the November number 

 of the Bulletin of the Torrey Botanical Club. 



A report on the development of secondary tumors was also 

 given. So-called secondary tumors have been found at points 

 distant from the original place of inoculation. This is due to 

 the fact that the original inoculation is made in the region of 

 a growing zone. The growth of the infected tissue keeps pace 

 with the growth of the organ. Unlike animal cancer, crown gall 

 tissues do not produce infiltrating strands or secondary tumors. 

 Efforts to produce secondary tumors by means of such devices 

 as water soaking, slitting the growing points, and making long 

 perforations in the growing zone, yield no secondary tumors 

 or strands, 



Arthur H. Graves, 



Secretary. 



Meeting of November ii, 1924 



The meeting of this date was held at the American Museum 

 of Natural History. 



The resignation of Mr. Claude E. O'Neal was accepted. 



The following candidates were elected to membership: 



Mr. Edwin E. Matzke, 3075 Hull Avenue, New York, N. Y. 



Mrs. Paula Milton, Wildwood, Katonah, New York. 



Miss Helen E. Saunders, 454 Seventh Street, Brooklyn, N. Y. 



Dr. M. A. Chrysler, Professor of Botany at Rutgers Univer- 

 sity, gave an illustrated lecture on " Collecting Cycads In Cuba, " 

 a trip which was made possible by assistance kindly furnished 

 by the New York Academy of Sciences. The speaker stated 

 that the trip occupied part of August and September of the 



