Observations on the structure and economy of plants : to which is added The analogy between the animal and the vegetable kingdom / by Robert Hooper.

  • Hooper, Robert, 1773-1835.
Date:
1797
Catalogue details

Licence: Public Domain Mark

Credit: Observations on the structure and economy of plants : to which is added The analogy between the animal and the vegetable kingdom / by Robert Hooper. Source: Wellcome Collection.

Provider: This material has been provided by Royal College of Physicians, London. The original may be consulted at Royal College of Physicians, London.

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    follows after froft ; but only in that part of the trunk oppofed to the folar rays. From thefe experiments It is evident, that the aqueous veflcls are principally lituated in the wood of trees ; that the water of a tree fur- niflied with leaves, is carried through the vef- fels to fupport thofe leaves; and that the fluid is conveyed upwards and downwards. The proper juice is fecreted from the com- mon juice, and occupies peculiar veffels and receptacles, and differs in its nature, fraell, tafte, colour, &c. In fome liliaceous plants it is green ; in the Fig, la6lea]; in the Celandine yellow; in the Plum tree, gummy ; in the Pine tree, refinous ; in the Maple, Jweet; in the Poppy, narcotic ; in the Spurge, cattjiic; and in many plants, hitter. Although this juice may appear to refide in every parr of the plant, yet its proper place feems to be between the cortex and albur- num ; for if an incilion be made in that part, it drops in greater abundance : hence it fol- lows, that the veflels deflined to convey the juice, are principally lituated between thofe barks. Such is the mechanifm, by which vegetables are nourilhed, grow, and unfold their parts. CHAP.