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CONTENTS. vil 
HEINRICH RIES. 
Notes on the Clays of New York State and their Economic Value. .... 40 
T. A. SAFFORD. 
The Construction of a Catalogue of Standard Polar Stars (abstract).... 186 
FRANCIS P. SMITH. 
A New Form of Condenser for Water Analysis,and a compact 
Wrst Ap Para GS 1 sys sixivticis deters aa OX vias ore sin wis oc Asceiebe cance 55 
C. H. SMYTH, JR. 
A Geological Reconnaissance in the Vicinity of Gouverneur, N. Y. 
RETURN Sace's «<i tele ee eee a Se ad aS 2 x'e(c nae om we aoe eal 97 
Petrography of the Gneisses of the Town of Gouverneur, N. Y. 
MMLMILS EE AGCG) epegs s reletetotayomtiere teeters Say sie aieis eis! G,s la si aveve ac vores simelets c aie oer 208 
O. 8S. STRONG. 
The Components of Cranial Nerves of Amphibia (abstract)............ 56 
E. B. WILSON, 
Artificial Production of Twins and Multiple Embryos in Amphiowus 
SepessricetrretsY, ANGIE OUIY \s fc. ow yon ae die Th ata GeV tolese > totae ned 4 17 
On Regeneration and the Mosaic Theory of Development (published 
OMIM MONEEEW Se cia t ns5 ob pS aoNOe Se ake victims cID nie vw d°cos awe = Sieia Sidi d's h A 0's Kena LoS 
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)......... 69 
