a number of the prickly larvae of the Antiopa butterfly (Vanessa Ant/opa), 

 a beautiful insect with deep purple wings and yellow borders, common to 

 Europe and America. The larvae, when young, are gregarious, and the 

 tree from which the branch was taken had been entirely denuded by them. 

 Some of the larvae were just changing, and admirably illustrated how the 

 suspended chrysalis state is assumed. Ordinarily rare, the species was 

 quite abundant in this vicinity the present year. 



Dr. S. Aughey, of Lincoln, Neb., was elected Corresponding 

 Member, and A. L. Whitley was elected Associate Member. 



A communication was then read by Mr. Washburn on Solar 

 Heat. 



June 19, 1876. 



C. V. Riley, President, in the chair. 



Twelve members present. 



The Corresponding Secretary read a letter from Dr. Samuel 

 Aughey, acknowledging his election as Corresponding Member. 



The Corresponding Secretary presented to the Academy in be- 

 half of Mr. Amos Sawyer, of Hillsboro, Ills., a spear-head, an 

 arrow-head, and several pieces of chipped chert, from an Indian 

 mound near Hillsboro. Mr. Sawyer states that near that place 

 there are several groups of mounds, three to five in a group, the 

 mounds being twenty to thirty feet in diameter, and three to four 

 feet high. They are covered with oak trees, some of which are 

 three hundred years old. In the centre of the mounds, innumer- 

 able pieces of chipped chert, and some arrow and spear-heads, 

 like those now presented, are frequently found. There is no flint 

 in that part of the country. The chert comes from the limestone 

 obtainable there. 



Dr. Geo. Engelmann remarked, in regard to the recent cool 

 weather, that the lowest observed temperature was 49 F., occur, 

 ring on Saturday, the 17th. In past years, the temperature had 

 not unfrequently fallen to 50 in the month of June, and 45 is 

 not rare, while in one year it fell as low as 42 . No injury seems 

 to be done by such cool weather. 



Mr. Riley stated that the grape-rot, which had set in in vari- 

 ous parts of Jefferson and St. Louis counties, had been checked 

 by the present cool weather. 



G. C. Broadhead presented a supplementary note to a former 

 paper on the 



