On the Mineralogy of New York Island. 193 



The vicinity of Corlears Hook was at that time, or rather 

 had been, the spot where the largest number of varieties was 

 to be obtained, probably from boulders. 



The most interesting things mentioned in his list, are adidaria 

 and cleavdandite, though it is not improbable that he applies 

 the former name to an cdhite or periMine found with the chlorite 

 before referred to, and he may have considered cleavelandite a 

 laminated mineral (perhaps calcite), of very peculiar appear- 

 ance, of which a few specimens occurred at 42d street with 

 handsomely crystallized quartz. 



In connexion with the mineralogy of this island, it is worthy 

 of remark, that the manner in which, in two or three instances, 

 the species are grouped, as well as in the individual varieties, 

 they exactly resemble specimens from foreign localities. 



One instance is the association of orthite with magnetite in 

 flesh-colored feldspar, like that from Finbo in Sweden, and a 

 still more striking resemblance is that of the periMine, apatite, 

 spectdar iron, and green sphene with chlorite, to the specimens 

 thus associated which are brought from the Grisons. 



It should not be forgotten that Manhattan Island presents 

 principally the granite and gneiss formations, the two rocks 

 which are everywhere the repositories of so many of the mine- 

 ral species, and from the number and character of those already 

 observed, it will be seen that it needs only a watchful eye to 

 secure a most interesting collection. 



I confess to a sort of patriotic pride in the profusion of good 

 things which it has yielded me, and the success which has 

 rewarded the searches my limited leisure has allowed me to 

 make ; and I am certain that it would be a just source of pride 

 to every lover of natural science, having a home in-our city, if 

 we had a suitable building for the display of a collection of the 

 mineral treasures which our island from time to time lias 

 afforded, and still continues to furnish. 



