354 BULLETIN OF THE NEW YORK STATE MUSEUM 



ties by the Auburn and Union Springs stones ; the corni- 

 ferous limestone by the Williamsville quarry specimen. 



The Potsdam sandstone is represented by the specimen 

 of the Potsdam Red Sandstone Company; the Hudson 

 river blue-stone by the Bigelow Blue Stone company's 

 specimen, from quarries near Maiden, and by the Oxford 

 blue sandstone ; the Medina sandstone by the stones from 

 Albion and Hulberton ; the eastern extension of the same 

 formation, by the Oswego Falls sandstone ; the sandstones 

 of the Portage geologic epoch, by the Portage and Warsaw 

 sandstones ; the Chemung, by the Olean sandstone. 



For the purpose of comparison with extra-limital stones, 

 which are used extensively in the cities of the state, the fol- 

 lowing representative specimens were included in the series : 

 granite, Hallowell, Maine ; limestones, oolitic, from Indiana 

 and Kentucky ; fine-grained and coarse-grained brown sand- 

 stones, from the large quarries at Portland, Connecticut ; 

 the Kibbe, Maynard and Worcester sandstones, from East 

 Longmeadow, Massachusetts ; Ohio sandstone, from Berea, 

 in that state ; Lake Superior red sandstone, from Portage, 

 Michigan; Belleville sandstone (freestone), New Jersey; 

 Potomac red sandstone, from Bristow, Virginia ; and Nova 

 Scotia sandstone."^* As far as possible, the stone of the 

 quarries selected was, in nearly all cases, above the average 

 in quality. The comparison is, therefore, between the best 

 representatives or types of the several kinds and quarry dis- 

 tricts. 



The chemical work and the physical tests were made 

 in accordance with my direction, at the laboratory of the 

 Rutgers College Scientific School, New Brunswick, N. J., 

 by F. A. Wilber, professor of analytical chemistry. 



*The specimens of Massachusetts sandstone were kindly furnished by Messrs. 

 Norcross Brothers, of Worcester, Massachusetts; the Connecticut sandstones, by the 

 Brainerd Quarry Company, of Portland, Connecticut; those from Berea, Ohio, Port- 

 age, Lake Superior, Belleville, New Jersey, and Nova Scotia, and the limestones from 

 Kentucky and Indiana, by R. Gill & Sons, foot of East One Hundred and Sixth street. 

 New York. 



