GENERAL INTRODUCTION. 



PART I. 



ZOOLOGY; 



BY JAMES E. DE KAY. 



PART II. 



BOTANY; 



BY JOHN TORREY. 



PART DI. 



MINERALOGY; 



BY LEWIS C. BECK. 



PARTS IV. & V. 





ORDER OF THE WORK. 



GEOLOGY AND PALEONTOLOGY; 



BY WILLIAM W. MATHER, EBENEZER EMMONS, LARDNER VANUXEM 



AND JAMES HALL. 



