APPPENDIX. 565 



his (Irving' s) views.* Irving, in his claim that in "the Keweenaw series 

 occur, as I was the first to announce, so far as I am aware, original 

 masses, not only of basic but also of acid eruptivcs, and of eruptives of 

 intermediate acidity, the various kinds constituting a continuous series 

 from the most basic to the most acid," * is incorrect, since all this was 

 distinctly announced some thirty years before in the Report on the 

 Copper Lauds by Foster aud Whitney (1850, pp. 58, 59, 70, 71, 78, 

 79) in the language of the science of that time. 



In the Third Annual Report before referred to, Irving further incor- 

 rectly states that Foster and Whitney regarded all the acidic or jaspery 

 rocks as metamorphosed sandstones, and all the conglomerates and sand- 

 stones as friction detritus. t 



In Irving's report there is further given a description of the micro- 

 scopic characters of the acidic rocks of the "Keweenawan series," in 

 such a manner as to lead any one not conversant with the history of the 

 subject to suppose that Irving was the first to make such an examina- 

 tion, although he was perfectly well aware of Wadsworth's previous la- 

 bors in that direction {ante, pp. 113-112). 



Attention has been previously called to his proceeding in the same 

 manner in reference to the Marquette rocks [ante, pp. 497, 498). This 

 statement was, however, met by Irving in a sophistical and mislead- 

 ing manner, and by a denial the correctness of which we do not grant. 

 Later, Irving appears to have tried to correct his former injustice to the 

 best of his ability. $ 



Nothing appears in the recently published first and third volumes 

 of the final report of the Wisconsin Survey calling for any modification 

 of the earlier part of this work, since one volume is devoted to a theo- 

 retical discussion of assumed data, and in the other all the Azoic areas 

 contained only one of the divisions of such rocks made by the Wisconsin 

 geologists, and they are assigned to such divisions on lithological evi- 

 dence only. 



* Amer. Jour. Sci., 1883 (.3), XXVI. 321, 322. 



t Foster and Whitney, Copper Lands, 1850, pp. 58, 59, 70, 71, 78, 79, 103, 109. 

 X Amer. Jour. Sci., 1883 (3), XXVI. 321, 322 ; 1884, XXVII. 130-134. 



AuGCST, 1884. 



