160 TRANS. OF THE ACAD. OF SCIENCE. 



such a climatic year is not very likely, it is also unlikely that the State of 

 Missouri will have to suffer another year's warfare from that worm. 

 However, as the insect has its residence on or just below the ground, the 

 free use of the plough over such ground must certainly be useful. Dig- 

 ging ditches around and driving hogs and fowls into the meadows, etc., 

 no doubt produce some good ; but in case a timothy field were invaded, I 

 would, after digging ditches, mow it down at once, in the expectation of 

 seeing the army move off for fresh food, or die. 



If any one wishes to observe the development of this insect in its three 

 stages, let him put some of the caterpillars in a box with some ground on 

 the bottom and covered on the top with a thin cloth ; feed them daily 

 with fresh grass until they hide in the ground and become pupa, and in 

 a couple of weeks he may see the moth emerge from them ; or by re- 

 moving the ground superficially on a timothy field where they have been 

 feeding, he may find now plenty of the pupa ; put them also in a box, and 

 in due time he may witness their last change — the moth. 



Dr. Engelmann made some remarks on the comet then to be 

 seen in the north-western sky, which from cloudiness of the 

 sky had become visible in St. Louis only on the previous 

 evening. 



Dr. T. C. Hilgard gave an account of his researches on the 

 history and development of the so-called fresh-water A f gce 

 of St. Louis — the observed forms of such desultory brooding- 

 phases, leproics, oscilkwious, desmidiaceo-confervaceous, nos- 

 tochiiie, jM'otococcous, hydrodictyine, all forming one and the 

 same "circuit of generations" of the thcdlus of Bryum 



ARGENTEUM. 



July 15, 1861. 

 The President, Dr. Engelmann, in the chair. 



Seven members present. 



Letters were read from Dr. Haidinger, Wien, June 12, 1861, on the 

 Nebraska Meteorite, and sending publications ; A. J. Bandelipr, Jr., 

 Highland, III., containing meterological observations for June, 1861, at 

 Highland ; Werner Verein, Briinn, April 15, 1861. — Roy. Society of Lon- 

 don, Mir. 19, 1861,— Mr. Senoner, Wien, Feb. 28, 1861,— Societa Ital. di 

 Scienze Nat., I860; Naturk. Verein, Bonn, Jan. 22, 1861,— K. K. Gesellsch. 

 der Wissensch. Gottingen, Feb. 22, 1861, — Verein fur Naturk. im Herzog- 

 thum Nassau, Feb. 5. 1861, — K. bohmische Gesellsch. der Wissensch., 

 Prag L^ft. 3, I860,— Physik .lisch-med. Gesellschaft, Wiirzburg, April 17, 

 1861, — Museum Francisco-Carolinum, Linz, Feb. 25, 1861, — K. Preuss 

 Akail. der Wissensch., Berlin, Feb. 28, 1861, — K. bayer. Akad. des Wis- 

 senschaffen, Munchen, Dec. 20. 1860, acknowledging receipt of Transac- 

 tions of the Academy and sending publications in exchange. 



Donations to the library were received as follows : 



Notiz fiber das Meteore ; SPn von Nebraska, von W. Haidinger, Wien, — 

 Die Meteoriten des K. K. Hof. Mineralien-Cabinets, am 30 Mai. 1861, 

 from Dr. W Haidinger; Jour. Franklin Inst, Philad., July, 1861, from 

 the Institute; X. Jahresb. des Werner- Vereins, Biiiin, 1861, from the So- 

 ciety ; Proc. Roy. Soc. London, Vol. X., 1859-60, 8vo— Vol. XI., No. 42 

 & 43, 1860-61, from the Royal Society; Verhandl. der K. K. zool.-bot. Ge- 

 sellschaft, Wien, Band X., 1860, from the Society ; Wochenschrift des Ve- 



