158 Association of American Geologists. 



A few suggestions may be made respecting the best modes of 

 preventing the ravages of the Hessian fly. They have all been 

 pubhshed before, by others, but they are of such a nature that 

 there is little probability that any of them will ever exterminate the 

 insect. The stouter varieties of wheat ought always be chosen, 

 and the land should be kept in good condition. If fall wheat is 

 sown late, some of the eggs will be avoided, but risk of winter-kill- 

 ing the plants will be incurred. If cattle are permitted to graze the 

 wheat fields during the fall, they will devour many of the eggs. 

 A large number of the pupee may be destroyed by burning the 

 wheat-stubble immediately after harvest, and then ploughing and 

 harrowing the land. This method will undoubtedly do much 

 good. As the Hessian fly also lays its eggs, to some extent, on 

 rye and barley, these crops should be treated in a similar manner. 



New Haven, Conn. 



Art. XV. — Proceedings of Learned Societies. 

 I. Association of American Geologists. 



The second annual meeting of this Association was held du- 

 ring the second week in April, at the rooms of the Academy of 

 Natural Sciences in Philadelphia. The following is an abstract 

 of the proceedings. 



Monday, April 5th, 1841, 4 o'clock, P. M. — The Association 

 met pursuant to the adjournment of last year. The regularly 

 appointed presiding officers being absent. Prof Henry D. Rogers 

 was called to the chair. After the completion of some business 

 arrangements, the Association adjourned until 10 o'clock, A. M. of 

 Tuesday. 



Tuesday, April 6th, 1841, 10 o'clock, A. M. — The Association 

 met pursuant to adjournment. Prof. Silliman took the chair. 

 Dr. L. C. Beck was appointed secretary. Messrs. W. R. John- 

 son, Va7iuxem,, H. D. Rogers, Mather, and Locke, were appoint- 

 ed a committee to report a plan of business for the meeting. 



The subject of mineral manures having been referred at the 

 last annual meeting, was proposed for discussion. Remarks were 

 off'ered, and facts stated hj Mr. Martin H. Boye, Drs. Charles T. 

 Jackson, James B. Rogers, J. Locke, and Mr. B. Sillimati, Jr. 



