376 INDEX. 



PAGE 



Sap, the aqueous . . . . . . 1 10 



, ascending .... ... 131 



, its channels traced by means of coloured infusions . . 86 



ascends through the alburnum . . . . . 1 60 



, its circulation most rapid in perpendicular shoots . . 99 



, experiments relating to its ascent . . . .149 



of trees, first put in action by the stems and branches . . 160 



, its ascending force . . . . . . .149 



.., power possessed by trees of transferring it from one tube to another . 93 



, its transmission in different directions through the alburnum . .131 



, conclusions drawn from experiments made with regard to its ascent . 96 



becomes altered in its passage from the root to the leaves . .118 



of trees, chemically changed during the progress of vegetation . .214 



in trees, experiments and observations on its motion . . .105 



, evidence of its descent through the bark . ... 138 



, true, its passage direct from the leaves to the roots . . .123 



of trees, evidence of its descent through the bark , . . 196 



in the radicle descends through the cortical vessels . .142 



, deposition of, in the cotyledons . . . . . 189 



, the true, elaborated by the leaves . . . .110. 269 



, its returning vessels extend from the points of the leaves to the extremity 



of the roots . ....... 87 



, the true, wholly generated in the leaves .... 200. 246 



, account of experiments on its descent in trees . . . .97 



, that which gives existence to the root and supplies it with nourishment, 



descends through the bark . . . : . . 1 60 



, causes of its descent . . . . . . .97 



elaborated in the leaves, descends by the bark . . 139 



deposited in the alburnum . . . . . .114 



, true, remarks on the probability of its descent through the alburnum as 



well as by the bark . . . . . . 119 



in the annual shoot passes downwards through the central vessels . 142 



, its passage from mature to young leaves . . . 170 



, its motion in the bark retrograde . . .89 



of trees, observations on the state in which it is deposited during winter 109 



, the true, supposed to mix partially with the ascending current . 1 70. 1 90 



, effects of its stagnation by ringing . ... 136 



, descending, effect of its stagnation in resinous trees . . .135 



, its specific gravity increases during its ascent . . . 152 



, its specific gravity in trees . ..Ill 



, effect of heat and cold on its motion . 90. 93 



of trees, its rise and fall governed by temperature . 214 



, watery . . . 340 



, vital, or arterial . . 340 



in annual plants, on the beneficial effects of its accumulation . . 328 



Sap-vessels, texture produced by their junction . .141 



