On the Erratic Phenomena of Scandinavia. 243 



object of my journey was the study of the cryptogamic 

 vegetation of the north, I neglected to keep regular notes 

 of the numerous observations made during my residence in 

 Sweden and Norway; but I hope soon to return to that 

 classical land of ancient glaciers, and I shall then not 

 neglect to direct my attention more particularly to this 

 subject. 



I have seen nearly all the great glaciers of Switzerland, 

 the Tyrol, and Carinthia, and I have everywhere observed 

 that a glacier produced striae by means of its surface as well 

 as its base. The glacier of the Etzthal, in the Tyrol, de- 

 scends like a curtain from the summit of a vertical cliff, and 

 deposits its moraine at the bottom. The cliff is striated. 



There has been much discussion lately regarding the 

 erratic phenomenon of the Vosges. I must confess, how- 

 ever, that none of the striated rocks which I have there seen 

 exhibit the characters of rock striated by glaciers. The 

 moraines which are alleged to have been observed in several 

 of the great valleys have but a very remote analogy to true 

 moraines : and all the blocks are rounded or blunted.* 



On the Chemical Composition of the Calcareotis Corals. 

 By B. SiLLiMAN Jun-t 



This article is from the work on Zoophytes, by J. D. 

 Dana,J for which the researches were undertaken. This 



* Comptes Rendiis, 1845 and 1846. 



t In vol. xlvii., p. 135, of Silliman's Journal, some earlier results obtained 

 by me on this subject were stated, which were prematurely published, 

 and greatly erroneous. The best antidote to an error of this sort is the 

 early publication of correct and trustworthy results. It is to be hoped 

 that the researches detailed in this paper are of this description, and the 

 attention of those interested in such studies is invited to the repetition 

 of the analyses here given. The geological interest of these observa- 

 tions is not in any way lessened by the results recently obtained, al- 

 though differing so much from those previously published. — S. 



X United States Exploring Expedition, during the years 1838-42, 

 under the command of Charles Wilkes, U. S. N. — Zoophytes, by James 

 D. Dana, Geologist of the Expedition. 741 pp. 4to, with a folio Atlas 

 of 61 plates. 1846. The Atlas is not yet published. 



