CONTENTS. 



PAGE 



INTRODUCTION ............ v 



LIFE OF THOMAS ANDREW KNIGHT, ESQ. ...... 1 



PART I. 



PAPERS ON VEGETABLE PHYSIOLOGY. READ BEFORE THE ROYAL 



SOCIETY ............ 81 



I. OBSERVATIONS ON THE GRAFTING OF TREES. Read April 30, 1795 81 



II. ACCOUNT OF SOME EXPERIMENTS ON THE ASCENT OF THE SAP IN 



TREES. Read May 14, 1801 84 



III. ACCOUNT OF SOME EXPERIMENTS ON THE DESCENT OF THE SAP IN 



TREES. Read April 21, 1803 97 



IV. EXPERIMENTS AND OBSERVATIONS ON THE MOTION OF THE SAP IN 



TREES. Read February 16, 1804 105 



V. CONCERNING THE STATE IN WHICH THE TRUE SAP OF TREES is 



DEPOSITED DURING WINTER. Read January 24, 1805 . . 109 



VI. ON THE REPRODUCTION OF BUDS. Read May 23, 1805 . . 119 



VII. ON THE DIRECTION OF THE RADICLE AND GERMEN DURING THE 



VEGETATION OF SEEDS. Read January 9, 1806 . . . . 124 



VIII. ON THE INVERTED ACTION OF THE ALBURNOUS VESSELS OF TREES. 



Read May 15, 1806 ISO 



IX. ON THE FORMATION OF THE BARK OF TREES. Read February 19, 



1807 136 



X. ON THE INCONVERTIBILITY OF BARK INTO ALBURNUM. Read 



February 4, 1808 143 



XI. ON THE ORIGIN AND OFFICE OF THE ALBURNUM OF TREES. Read 



June 30, 1808 148 



XII. ON THE ORIGIN AND FORMATION OF ROOTS. Read February 23, 



1809 153 



v XIII. ON THE CAUSES WHICH INFLUENCE THE DIRECTION OF THE GROWTH 



OF ROOTS. Read March 7, 1811 ...... 157 



XIV. ON THE MOTIONS OF THE TENDRILS OF PLANTS Read May 4, 1812 164 



XV. ON THE ACTION OF DETACHED LEAVES OF PLANTS. Read June 13, 



1816 . . 168 



