Experiments and observations on the vegetation of plants : which shew that the common opinion of the amelioration of the atmosphere by vegetation in solar light, is ill founded / by James Woodhouse.

  • Woodhouse, James, 1770-1809.
Date:
[1802?]
Catalogue details

Licence: Public Domain Mark

Credit: Experiments and observations on the vegetation of plants : which shew that the common opinion of the amelioration of the atmosphere by vegetation in solar light, is ill founded / by James Woodhouse. Source: Wellcome Collection.

Provider: This material has been provided by the National Library of Medicine (U.S.), through the Medical Heritage Library. The original may be consulted at the National Library of Medicine (U.S.)

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    experiments, did not affect the air in five days: omc diminiflj- ed its purity in three hours; and others altered it in a moftflow and gradual manner, caufing little change in it in twenty days. jLeaves expofed III. Of the Effecls produced by the Leaves of Plants in atmofphe- Wure of In a rka- Air imPreSmted ™ith Carbonic Acid Gas, and expofed to ncfpheric and the Light of the Sun. arbonic acid gas. A handfull of the leaves of mimofa virgata, euphorbia picla, l digitalis purpurea, franklinia altamaha, afparagus officinalis, coryllus avellana, rhus glabrum, ariftotochia fiphoe, and peri- ploca grasca, were feparately expofed feven hours to the light • of the fun, in thirty-fix ounce meafures of atmofpheric air, im- pregnated with four ounce meafures of carbonic acid gas, from he carbonic the carbonate of lime and fulphuric acid. The fixed airdifap- nd tlie^r!*-' Peared»and tne atmofpheric air was fo much increafed in purity, ion of oxigen in as to devour two meafures of nitrous air. he mixture was -j^e leaves of thefe plants, kept over night in the fame air, ugmented. , . , n the dark the gave carbonic acid gas in the morning; and its purity, in every :avei produced inftance, was confiderably diminifhed. as< The leaves of mimofa virgata and amygdalus perfica, were )ther leaves ex-alfo feparately expofed nine hours to the influence of folar thh the for '* ^8n^ in forty ounce meafures of atmofpherical air, in which efult. fixed air had been formed by leaving a fungus to putrefy it. The carbonic acid gas difappeared, and the purity of the at- mofpherical air was increafed from 30 to 80. Table of experi- IV. The following Tables •willjhexu the Quantity and Purity of nents on leaves oxigenous Gas, obtained by expofmg a fmall Handful of the Kht under Leaves of Plants to the Light of the Sun, in forty Ounce Mea- ump water. fares of Pump Water. This water was taken from a well funk within a few yards of aneceflary, from which it was impregnated with carbonic acid gas, as appeared from an analyfis. The leaves were feparately expofed in glafles arranged near each other, and from eight to thirteen comparative experiments were made at one time.