140 



stem" in celery has been demonstrated to be due to boron de- 

 ficiency. 



Microscopic examination of boron deficient plants indicates 

 that the meristematic cells enlarge, become more acid, and 

 finally explode. This disintegration follows back through the 

 cambium and finally affects all of the vascular tissues. Chemical 

 analysis shows that there is an accumulation of ammonia in 

 boron deficient plants. The percentage of soluble nitrogen 

 compounds is greater in boron deficient than in normal plants, 

 but the percentage of protein nitrogen less. 



One-half part per million of boron is enough to satisfy the 

 nutritive requirements of the dicotyledonous plants tested and 

 five parts per million is definitely toxic. However, the boron re- 

 quirements of various kinds of plants differ. The monocotyle- 

 dons in general seem to have a very low boron requirement, 

 cotton requiring twice as much boron as corn. Experiments have 

 shown that plants are not able to store boron. 



D. Elizabeth ]\Iarcy 

 Recording Secretary 



Meeting of April 21, 1937 



The meeting was called to order by President Barnhart at 

 the Brooklyn Botanic Garden at 3:30 p.m. Eighteen persons 

 were present. 



The minutes of the last two meetings were read and ap- 

 proved. The recording secretary stated that she had received 

 the application of Mr. Edgar B. Harger for annual membership, 

 and the applications of Mrs. Robert C. Hill, Miss Marion K. 

 Ober, and Mrs. Stephen R. Smith for associate membership. 

 It was reported that letters of resignation had been received 

 from Mr. C. M. Roberts and Mr. Rodney B. Miller. 



In response to the Club's petition that the area proposed 

 for Mt. Olympus National Park not be reduced, a letter was 

 received from Mr. Arno B. Cammerer of the Department of the 

 Interior. He stated that the bill for the proposed park had been 

 defeated but that a new bill (H.R. 4724) has been introduced 

 which provides for a much smaller park area but with adequate 

 examples of the primeval forest of the Olympic Peninsula. 



"Inheritance studies on disease resistance in sorghum" were 

 discussed bv Dr. Elizabeth Marcv of the Brooklvn Botanic 



