TABLE OF CONTENTS. ix 
LECTURES OF THE PUBLIC ILLUSTRATED COURSE OF 1889. 
E. C. BOLLES. 
PAGE 
The Little Builders of the Earth (March 25, 1889), without abstract, 151 
FREDERICK H. CHAPIN. 
Glacial Moraines in the Front Range of Colorado (April 15, 1889), 
MIEMEL IZUBEPIRCE:.. 5.2¢ oo hone a ae nts Sakae ataet se a dee tine a= 163 
DARWIN G. EATON, 
Volcanoes, their Distribution and Phenomena (January 28, 1889), 
SEPA MID EN ne oe 250 atte ini ep a aa ai” os gta aed, os sie ahR oo 
ALPHEUS HYATT. 
Modes of Evolution in Fossil Shells (February 11, 1889), abstract.... 114 
W. LECONTE STEVENS, 
Sensitive Flames and the Diffraction of Sound (March 4, 1889), 
MAN APE <2 Soe nty rik Oe Ad Stcaks ure valg kittaia's dam's, 6 Aoae te Wieiatna a 130 
