ADVERTISEMENTS. | riù 
BIOLOGICAL LECTURES 
= Marine Biological! Laboratory, 
WOOD'S HOLL, 1890. 
Price by Mail, Postpaid, $1.85. 
— 
. Specialization and Organization, Companion Principles of All 
Progress.—The Most Important Need of American Biology. 
—Prof. C. O. Wuirman, Clark University. 
Il. The Naturalist’s Occupation: 1. General Survey. 2. A 
Special Problem.—Prof. C. O. WHITMAN. 
Ill. Some Problems of Annelid Morphology.—Prof. E. B. WiLsoN, 
Bryn Mawr College: 
IV. The Gastræa Theory and Its Successors.—Dr. J. P. McMurricn, 
Clark University. 
' V. Weismann and Maupas on the Origin of Death.—Dr. EDWARD 
G. GARDINER, Mass. Institute of Technology. 
VI. Evolution and Heredity.—Prof. Henry FAIRFIELD OSBORN, Prince- 
ton College. 
VII. The Relationships of the Sea-Spiders.—Dr. T. H. MoRGaN, 
Johns Hopkins University. 
VIII. On Caryokinesis.—Dr. S. Waraser, Clark University. 
IX. The Ear of Man: Its Past, Present, and Future.—Dr. Howarp 
AYERS, Lake Laboratory, Milwaukee. 
- The Study of Ocean Temperature and Currents.—Prof. 
WituiaM Ligsey, Jr., Princeton College. 
ps 
he Lectures are illustrated with numerous cuts, most of which are 
entirely new. š 
GINN & COMPANY, PUBLISHERS, 
BOSTON, NEW YORK, CHICAGO, AND LONDON. 
