ORDER OF THE WORK. 
GENERAL INTRODUCTION. 
PART I. 
ZOOLOGY ; 
BY JAMES E. DE KAY. 
PART If. 
BOTANY; 
BY JOHN TORREY. 
PABT II. 
MINERALOGY ; 
BY LEWIS C. BECK. 
PARTS Iv. & V. 
GEOLOGY AND PALEONTOLOGY ; 
BY WILLIAM W. MATHER, EBENEZER EMMONS, LARDNER VANUXEM 
AND JAMES HALL. 
