December, '22] rudolfs: nicotine delivery from dusts 421 



Some of them may object to being called this bat they are just the 

 same. 



Mr. Lovett asked if there were any papers which were missed and 

 called for these if there were any as this could have occurred since the 

 Secretary could not be present and the program was arranged late. 

 There were no outstanding papers to be read. 



Mr. Edgar M. Ledyard announced that his office was 904 Newhouse 

 Building and that he would be very glad to extend any courtesies 

 possible to members and hoped that they would call upon him at any 

 time if their movements around the country could be facilitated or if 

 they wanted to get in touch with collecting areas or infested areas, or 

 if they wished to establish financial connections. 



The matter of meeting at 2 p. m., then adjourning to meet with the 

 Pacific Coast Entomological Society and the Entomological Society 

 of America as per motion duly seconded and carried, was discussed 

 and Mr. Ledyard was requested to put a notice on the door of Room 44 

 of the Industrial Building to this effect. 



At 11:55 A. M., it was moved, seconded and carried that since there 

 was no more business to come before the meeting at this time the meet- 

 ing be adjourned in order that there might be time for visiting. 



NICOTINE DELIVERY FROM DUST CARRIERS^ 



By WiLLEM Rudolfs, Ph.D., Biochemist N. J. Agricultural Eperiment Stations 



During a study of nicotine dusts the problem to improve nicotine 

 delivery from dust carriers appeared to be essentially of a chemical 

 nature with some physical factors involved. A number of analysed 

 clays were impregnated with definite amounts of nicotine sulfate and 

 the evolution of nicotine from the impregnated dusts determined by 

 drawing a stream of air conditioned to 80° F and 73.6 per cent relative 

 humidity through the dust at a rate of one liter in 10 minutes. 



The results showed a great difference from the different dusts, ranging 

 from 0.35 per cent nicotine evolution in 48 hours to 16.15 per cent. 

 In comparing the results of nicotine delivery from clay carriers with the 

 free acidity of the clays no close correlation could be observed, but if the 

 amounts of calciimi and magnesium oxids together with the hydrogen-ion 

 concentrations of the clays was compared with the nicotine evolution 

 a more apparent correlation was noticed. An examination of the absorp- 

 tion, water-holding capacity and flocciilation data of the clays together 



iPaper No. 99 Journal Series, Department of Entomology, N. J. Agricultural 

 Experiment Station. 



