Proceedings 2 1 9 



Oscar Halvorson, Two Harbors. 



H. F. Burchard, St. Paul. 



The reports of the Secretary and Treasurer showed a bal- 

 ance in the treasury at the beg-inning of the year of $6.49, re- 

 ceipts $64.92; disbursements $65.91. Balance now in treasury, 

 ■$5.51 with no debts. 



The report of the Corresponding Secretary was omitted. 

 (See pages 221-7). 



Officers were elected as follows: 



President, ------- Prof. D. T. AlacDougal. 



Mce President, ----- O. W. Oestlund. 



Recording Secretary, - - - A. D. Roe. 



Corresponding Secretary, - - C. P. Berkey. 



Treasurer, -----. E. C. Gale. 



^ • , . M' C. W. Hall, 



trustees tor three vears. - \ ^t -1- t- 1 1 



( H. i . Eddy. 



Program : Terrace Gravels about St. Anthony Falls, by 

 F. W. Sardeson. 



[ahstract,] 



The occurrence of terraces younger than the Glacial drift and 

 older than St. Anthony falls and gorge of the Mississippi river was 

 indicated with considerable detail. In particular a terrace gravel 

 •containing shells of mollusks 100 feet above the present level of the 

 river below the falls was described and specimens were exhibited. 

 This occurrence has been described by Hall and Sardeson, Bulletin 

 Geological Society Am. Vol. x, p. 358 and Fig. 2, November, 1899. 



Unusual Occurrences of Copper in Minnesota, by C. P. 

 Berkey. 



Antennal Sense Organs of the Aphididae, by O. W. Oest- 

 lund. 



[abstract.] 



Attention was called to the gre^t variety of sense organs on the 

 antennae of the Aphididae, and their value for distinguishing species. 

 The most conspicuous are the so called sensoria, small membranous 

 areas scattered over the surface. Of these three distinct types may be 

 distinguished: 1. Apical Sensorta, a single large sensoria close 

 to the apex of the fifth and the sixth joints. The first to appear in the 

 larva and the most constant sensoria present. 2. Marginal Sen- 

 soria. a group of very small sensoria near the margin of the apical 



