40 



PULMONARY ARTERIES 



Sect. IV. I. r. 



branches of trees with apples on them, and taking off the leaves, that 



an apple exhaled about as much as two leaves, the furfaces of which 



; nearly equal to that of the apple ; whence it would appear, that 



apples 



leaves. 



Oth 



h 



as 



good a claim to be termed perfpiratory organs as 



h 



believed them the excretory organs of excrement! 



juices ; but as the vapour exhaled from vegetables has no tafte 



this id 



more probable than the oth 



Add 



this, th 



moid weather they do not appear to perfpire or exhale at all, as fh 



by fome ftatical experiments of Dr. Hal 



ke thofe of Sand 



on the perfpiration of the human body ; which perfpiration has alfo 

 been fuppofed to be an excrement, which is fhewn to be an erroneous 



that its defign is limply to preferve the 



opinion 



and 



J ikin fuppi 



•like the tears diffufed on the eye-ball to preferve its tranfparency, 

 explained in Zoonomra, Vol. II. Clafs I. i, 2. iji. 



th 



Others have believed that vegetables abforb much nutriment by 



found 



and quote an experiment of Dr. Prieftley's, wh 

 plants placed in water under glaffes grew much fafter, when th 

 hich they grew, was occafionally impregnated with putrid exh 



tions. But th 



IS anoth 



periment of Dr. Prieftley's, which 



fhould be mentioned, and that is, that he agitated one part of a veffel 

 of water beneath a glafs filled with putrid exhalation, and the whole 

 of the water prefently became very fetid. Hence we may conclude, 

 that in the firfl: cafe the water, in which the vegetable grew, abfcrbed 

 the putrid exhalations from the air over it, and that thefe 

 abforbed from the water by the roots of vegetables, which correfp'^nd 

 the ladleals of the fl:omach and inteftines of animals ; and that they 



o 



to 



thus received nourifhment from the putrid vapou 



alid not by th 



organ s. 



which v^'^e fliall endeavour to (hew to be fimply refp 



HPifeBj^J^'S ^^^e conceived, that the leaves of plants acqui 

 'Mii4fi£?^ffi.J" ^"^^^<^^ to thefe it may be obferved, th 



no 



I 



