Experiments and Observations Relating to Various Branches of Natural Philosophy with a Continuation of the Observations on Air. the Second Volume - Softcover

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated.1781 Excerpt: ... circumstances, had no air at all in it. A very Httle air was strained through this plant, and it was almost thoroughly phlogisticated; for the measures of the test were 1. 7. Nitrous air I have always found to be fatal to vegetable, as well as to animal life, and so it proved in this instance; as indeed it had done the preceding summer. From the 1 8th of May to the 18th of June, a quantity of this air was diminished by a willow plant to one fourth, and then it was so changed, that it admitted a candle to burn in it with a gently blue enlarged flame; a state whichy'ai 1 have observed, nitrous air generally passes through before it becomes mere phlogisticated air, and which, in the course of thi9 volume, will appear to be nitrous air partially dephlogisticated. Phlogiston being the pabulum of plants, as it is probably of animals too, dephlogisticated air must (as indeed I had found before) be unfavourable to the growth of plants in general; and I constantly found it to be so in the case of the willow plant. To give it the fairer trial, I introduced a small but healthy thy plant, growing in the marsh, into a jar of this air, so large that the plant was not hi the least incommoded, and it did. not reach the top of the jar by several inches. This was done the i8th of May, but it died presently, and before the air was sensibly diminished; which was the case afterwards, ow ing, probably, to the putrefaction of the plant; But even then, being examined with two fcqual quantities of nitrous air, the measures) of the test were i. o.. Having filled a large earthen pot with wa-i ter, and having sticks thrust into the earth quite round it, for the convenience of fastening jars with their months inverted in water, in order to fill them with different kinds of air, aud int...

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