Ylll TABLE OF CONTENTS. 



PAGE 



ALBERT R. LEEDS. 



The American System of Purification of the Water Supplies of 

 Cities (November 29, 1886) 42 



DANIEL S. MARTIN. 



A Monument to J. J. Audubon (August 15, 1887) 163 



F. J. H. MERRILL. 



Notes on the Geology of Block Island and Nantucket (October 25, 

 1886) 35 



Note on the Green Pond Mountain Group of New Jersey (December 

 6, 1886) 59 



HENRY A. MOTT. 



A Limit to the Height of the Atmosphere (November 8, 1886), with- 

 out abstract 40 



JOHN S. NEWBERRY. 



Earthquakes, What is Known and Believed about them by Geolo- 

 gists (October 18, 1886) 18 



The Fauna and Flora of the Trias of New Jersey and the Connecti- 

 cut Valley (March 28, 1887), abstract 124 



Coelosteus, a New Genus of Fishes from the Lower Carboniferous 



Limestone of Illinois (May 2, 1887), abstract 137 



A New Meteorite from Tennessee (June 6, 1887), abstract 160 



Description of a New Species of Titanichthys (August 15, 1887), ab- 

 stract 164 



CHARLES E. PELLEW. 



Recent Investigations on the Mitigation of Pathogenic Bacteria 

 (November 15, 1886), without abstract 40 



HENRY H. RUSBY. 



Notes of Recent Travel on a Journey from La Paz to Para, through 

 the Bolivian Andes and the Valleys of the Beni and Madeira 

 Rivers (April 4, 1887), without abstract 129 



Further Notes of a Scientific Journey across South America, through 

 the valleys of the Beni and Madeira Rivers (May 2, 1887), with- 

 out abstract • • 138 



Concluding Observations in a Scientific Journey across South 

 America, from the Andes to the Mouth of the Amazon (May 16, 

 1887), without abstract 147 



