INTRODUCTION 



STEUCTUEAL AND SYSTEMATIC 



EOT AN Y, 



AND VEGETABLE PHYSIOLOGY, 



A FIFTH AND REVISED EDITION 



THE BOTANICAL TEXT-BOOK, 



ILLUSTRATED WITH OVEK THIRTEEN HUKDRED WOODCHTS. 



By ASA GRAY, M.D., 



nSHER PEOFJBSSOE OP HATDRAL mSTORY IN HARVARD UNIVERSITT. 



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