204 



THE MUSEUM. 



wholly of silica and carbonate of lime; 

 the proportion of each is nearly equal. 

 Now, supposing the limestone to have 

 been deposited under water, as sedi- 

 ment, or as the solid remains of ma- 

 rine life, as I suggested in the previous 

 paper, it is easy to conceive that the 

 water above might have become charg- 

 ed with carbonic acid. In this case 

 the water would permeate the deposit 

 and the carbonic acid would wash out 

 every trace of lime leaving the silica in 

 the form of a very porous quartz rock. 

 If this process took place while the de- 

 posit was in a plastic condition, and, 

 while in that condition, a sufficient 

 pressure was applied, a compact, gran- 

 ular quartz rock would result, which, 

 by the application of sufficient head 

 and possibly by pressure alone would 

 be changed to crystal quartz. This I 

 believe to be the true origin of quartz 

 rock as it exists in the clay slate of 

 this locality. 



I am gradually arriving at an under- 

 standing of most of the geological phe- 

 nomenon of the clay slate belt. Until 

 recently I have been troubled to ac- 

 count for the alternate strata of slate 

 and limestone, but I am beginning to 

 see my way clear, and in a future num- 

 ber of the Museum I hope to present 

 a satisfactory solution of the problem. 



The Oologists' Association. 



There was organized about one year 

 ago an association for advanced oolo- 

 gists and as it will be of interest to many 

 of the readers of The Museum. I 

 will go into particulars in describing 

 the organization. 



The objectS'of the Oologists' Associa- 

 tion are the encouragement of the scien- 

 tific study of North American Oology, 

 the publication of the results of such 



study and the protection of its mem- 

 bers in exchanging specimens etc., etc. 



Any oologist who is over eighteen 

 years of age and who has a collection 

 of eggs of North American birds num- 

 bering over 200 specimens is eligible 

 to membership and can apply to any 

 officer or member. 



A membership fee of fifty cents is 

 charged and dues are fifty cents p?r 

 year. 



Some of the best known oologists m 

 the county are members and beyond a 

 question this organization will before 

 long be to the oologists what the A. 

 O. U. is to the ornithologists. 



Isador S. Trostler, Omaha, Neb., 

 President; Harry W. Kerr, River 

 Sioux, la.. Vice-president; Will E. 

 Snyder, Beaver Dam, Wis., Secretary; 

 Dr. Morris Gibbs, Kalamazoo, Mich. , 

 Treasurer; Jos. A.Dickinson, Gresham, 

 Neb., Executive Committeeman. 

 Among the prominent oologists who 

 are members may be named. Ed. 

 Van Winkle, Van's Harbor, Mich. 

 John H. Bowles, Ponkapog, Mass. 

 Dr. C. C. Purdum, Balitmore, M. D. 

 R. W.Williams, Jr., Tallahassee, Fla. 

 G. W. Dixon, Watertown, S. Dak. 

 Walter E. McLain, New Vineyard, 

 Me. 



Any of the above will be glad to 

 give inquirers any desired information 

 regarding this organization. 



Isador S. Trostler, 



Omaha, Neb. 



Queries and Suggestions. 



HIBERNATION. 



Those who collect and hatch Cecro- 

 pia, Polyphemus and Promethia co- 

 coons, have noticed that the period 

 for the emerging of' the moths may be 



