346 NATURAL HISTORY BULLETIN. 



face today.* The habits of these snails are known. They 

 present a tangible, definite basis for conclusions, and their oc- 

 currence is wholly consistent with, and best explained by the 

 seolian hypothesis of the origin of the loess. These fossils 

 will continue to be the rock which will wreck the arguments 

 of the advocates of the glacio-fluviatile and aqueous theories, 

 until an explanation of their presence in the loess, consistent 

 with these theories and based upon observation and fact, can 

 be presented. 



THE LANSING DEPOSIT NOT LOESS. 



The preceding paper was written, as stated therein, before 

 a visit was paid to the Concannon locality, and deals only with 

 the general question of the loess. The writer has since visited 

 the Lansing cave, and made an examination of the deposit 

 under which the Lansing human remains were found, and fully 

 agrees with Dr. Chamberlin| "that the deposit is not true origi- 

 nal loess." The Concannon cave and its surroundings have 

 been quite fully described and discussed, ;|; but there are still 

 certain features of the Lansing case, and of the loess in gen- 

 eral, which call for further discussion. 



In the paper cited (p. 264), Professor Winchell describes the 

 Lansing deposit as "upland loess of the mixed nature of much 



*See the writer's discussion of this subject: la. Acad. Sci., vol. v., 

 pp. 14-15, 1898; vol. vi, pp. 98-113, 1899; etc. 

 tjour. of Geol., vol. x, p. 769, — 1902. 

 J See especially the following: 



Chamberlin, T. C. , Jour, of Geol. vol. x, pp. 754-769, 1902. 

 Winchell, N. H. , Am. Geol., vol. xxxi, pp. 295-303, 1903. 



