A TREATISE 



ON 



THE FORCES WHICH PRODUCE 



THE 



ORGANIZATION OF PLANTS. 



WITH AN 



APPENDIX, 



CONTAINING SEVERAL MEMOIRS ON CAPHIARY ATTRACTION, ELECTRICITY, 

 AND THE CHEMICAL ACTION OF LIGHT. 



B Y 



JOHN WILLIAM DRAPER, M.D., 



PROFESSOR OP CHEMISTRY IN THE UNIVERSITY OP NEW-YORK. 



SECOND EDITION 



WITH ADDITIONS AND EMENDATION'S. 



N E W-Y O R K : 



PUBLISHED BY HARPER & BROTHERS, 



No. 82 CLIFF-STREKT. 



1845. 



