CONTENTS. vii 



HEINRICH RIES. 



Notes on the Clays of New York State and their Economic VaUie 40 



T. A. SAFFORD. 



The Construction of a Catalogue of Standard Polar Stars (abstract). ... ISO 



FRANCIS p. SMITH. 



A New Form of Condenser for Water Analysis, and a compact 



Distilling Apparatus 55 



C. H. SMYTH, JR. 



A Geological Reconnaissance in the Vicinity of Gouverneur, N. Y. 



(with map) 97 



Petrography of the Gneisses of the Town of Gouverneur, N. Y. 



(illustrated) 203 



O. S. STRONG. 



The Components of Cranial Nerves of Amphibia (abstract) 5G 



E. B. WILSON, 



Artificial Production of Twins and Multiple Embryos in AmpMoxiis 

 (published by title only) 17 



On Regeneration and the Mosaic Theory of Development (published 



by title only). 138 



J. L. WORTMAN. 



On the Mammalian Fauna of the Lower Miocene (published by title only) 50 

 The Relationship of the Puerco Beds to the Laramie (abstract) 60 



