Elements of agricultural chemistry, in a course of lectures for the Board of Agriculture / By Sir Humphry Davy.

  • Davy, Humphry, Sir, 1778-1829.
Date:
1813
Catalogue details

Licence: Public Domain Mark

Credit: Elements of agricultural chemistry, in a course of lectures for the Board of Agriculture / By Sir Humphry Davy. Source: Wellcome Collection.

    130/428 (page 104)
    l Constituents of 100 parts of the Ashes. co c t- cl, ~ 3,5 cri CO 0 <M TO CO CL) •4H 03 CO <D 03 cu O ^ §5 ** c X-. 0 a O M w c *ro co J=. Oh CO 0 C O X> u TO ■a '5 O 10 0 CO QJ E-2 0 0, U V O 1 = <-M <U JD 3 3 -C Oh >N 01 O CO .H cr O >-1 e to eo ^ 2 u, <u , 0 co rC U j= TO u £ O < 03 W TO w S 68 Leaves of rhododendron ferrngi- neum, raised on Breven, a grani tic mountain, June 27 — 25 — 21,1 l6>75 16,75 2 5»77 3M2 69 Branches of ditto, June 20 — 8 — 22,5 10 39 0,5 5‘4 22,48 70 Spikes of ditto, June 27 - — 8 — 24 11,5 29 I 11 24,5 7l Leaves of fir (pinus ahies), raised on Jura, June 20 - — 29 — 16 12,27 43>5 2,5 1,6 24,13 72 Ditto, raised on Breven. June 27 — 29 — 15 12 29 *9 5 5 *9>5 73 Branches of pine, June 20 — 15 — is 74 Whortleberry (vaccinium myrtil- lus), raised on Jura, Aug. 29 — 26 — J7 / 8 42 °,5 3,12 19,38 75 Ditto, raised on Breven - — 22 — 24 22 22 5 9’S 17*5 Besides the principles, the nature of which has been just dis- cussed, others have been described by chemists as belonging to the vegetable kingdom : thus a substance, somewhat analogous to I the muscular fibre of animals, has been detected by Vauquelin in the papaw; and a matter similar to animal gelatine by Bra- connot in the mushroom ; but in this place it would be improper to dwell upon peculiarities ; my object being to offer such gene- ral views of the constitution of vegetables as may be of use to the agriculturist. Some distinctions have been adopted by sys- tematical authors which I have not entered into, because they do not appear to me essential to this enquiry. Dr. Thomson, in his elaborate and learned system of chemistry, has described six vegetable substances, which he calls mucus, jelly, sarcocol, aspa- ragin, inulin, and ulmin. He states that mucus exists in its purest