319 



state continues about twelve days ; the moths then appear and 

 immediately go about depositing their eggs, after which they die. 

 This perfect state lasts only four or five days. Such is the 

 routine of their reproduction. When they appear early in the 

 season, there are usually three broods ; but some years they come 

 so late that only a single new generation is seen. In either case, 

 the last brood almost invariably perishes throughout, being either 

 killed instantly by the frost, or dying from starvation, having 

 eaten all the cotton before their transformations take place. It 

 follows, therefore, that these ravaging insects as they appear in the 

 cotton fields of the south, do so at the loss of that portion of their 

 race, for they leave no progeny behind them. At the same time, 

 this condition of things makes the matter the more deplorable for 

 the planter, for, as he has to contend with a suddenly invading foe 

 from foreign parts, he is rendered wholly powerless in averting 

 this regularly periodical destruction of property. 



The Secretary read a letter from Mrs. Adams, in reply to 

 a letter from himself, communicating the vote of the Soci- 

 ety, expressing their sympathy with her in the recent decease 

 of her husband, Prof. C. B. Adams, of Amherst College. 



Dr. Kneeland read a letter from Mr. David Christie, on a 

 new species of Ammonite. Referred to the Publishing 

 Committee. 



Dr. S. L. Sprague was elected a resident member. 



ADDITIONS TO THE LIBRARY DURING THE QUARTER ENDING 

 MARCH 31, 1853. 



Congressional Report of Hon. E. Stanley and A. Evans, on the 

 Ether Discovery. 8vo. Pamph. 1852. From Dr. C. T. Jackson. 



These pour le Doctorat en Medicine. Par S. L. Bigelow. 4to. 

 Pamph. Paris. 1852. Recherches sur les Calculs de la Vessie. 

 Atlas. Fro7n the Author. 



