Restorations of American Dinosauria. 567 



not only an ornament to their great city, and a healthy recreation- 

 ground to their fellow-citizens, but also a useful, good, and compre- 

 hensive educational institution to all who may visit it, gentle and 

 simple, citizen and stranger. We must add that the statistics of the 

 work done in the Park, of its visitors, and of other matters con- 

 cerning it, speak clearly and satisfactorily of the well-being and 

 advancement of the Americans, of their administrative powers, and 

 of their knowledge of, and desire to do, whatever is likely to be 

 beneficial to mankind at large, in " bringing to light new truths, 

 stimulating the progress of invention, discovery, and commercial 

 enterprise, no less than educational reform." — T. E. J. 



II. — Memoirs of the Geological Survey of Ireland. Expla- 

 nation OF Sheet 105, etc. Dublin, 1869. 

 THIS memoir, by Mr. G. H. Kinahan, on the geology of the district 

 around Galway, possesses a melancholy interest in being, pro- 

 bably, the last of the published works of the Irish Survey, to which 

 the late lamented Director affixed his signature. As will be seen 

 by reference to the sheet (105), the entire district, with the ex- 

 ception of that portion occupied by surface deposits and the Car- 

 boniferous limestone, is composed of Igneous and Metamorphic 

 rocks, and, therefore, possesses a special importance in a petrological 

 and mineralogical point of view. The igneous rocks, described by 

 the author, are coloured under three tints, respectively denoting, 

 1. Felstone, and porphyritic felstone ; 2. Greenstone, or Diorite ; 

 3. Granite, which last is divided into three subdivisions, viz. : 

 Intrusive granite, foliated or stratifi.ed (?) granite, and porphyritic 

 granite. 



Commencing with the granite, a careful perusal of the Memoir, 

 and an examination of the map itself, does not appear to warrant 

 these subdivisions. In the first place, we can find no reason for 

 considering the great mass of granite less intrusive than the small 

 outlying bosses, which are expressly marked as intrusive, more 

 especially since some parts of the great mass are also marked 

 as intrusive, and no evidence is given which appears to justify the 

 conclusion that this great continuous mass, and the other smaller 

 masses, have more than one common origin ; for this reason, there- 

 fore, notwithstanding Mr. Kinahan's somewhat elaborate attempt to 

 infer such subdivisions, we are inclined to the opinion that the 

 intrusive, foliated, and porpliyritic granites form in dejjth but parts 

 of one and the same mass. The statement (p. 7) that granite 

 " becomes Pej/mafiie when Scapolite seems to replace part, or the 

 whole of the felspar," will certainly not be accepted by Petrologists. 



The remarks (p. 11) under the head of Diabase and Diorite, are 

 so indefinite as to leave much doubt as to the real character of the 

 rocks alluded to under these denominations. The observations made 

 on the Gneiss of the district leaves an impression on the mind of 

 the reader that the rocks, described under this name, are in reality 

 only metamorphic schists further altered and rendered felspathic by 



