384 



TABLE ^.—Continued. 



In conclusion, we present the foregoing observations as solving a 

 problem which has been generally heretofore denied or doubted, and 

 as proving the discovery of a semi-diurnal lunar tidal wave, of the 

 dimensions herein described, on Lake Michigan ; and hence we infer 

 a similar one on the other great fresh-water lakes of North America. 



J. D. Graham, 



Member of the Society. 



Dr. Bache read an extract from a letter, dated Caermar- 

 then, Wales, July 26, 1860, received by him from the Presi- 

 dent of the Society, Dr. George B. Wood, in relation to the 

 recent discovery, in the valley of the Somnie, in the northwest 

 of France, of fossil bones, associated with rude implements of 

 flint, certainly made by man, in the same geological stratum. 



