I. , 



"4. 



'^s will 



^er-ie, 



^efu 



n\ 



ter 



Vi-1. 



1 



er 



elth 



^''i-ikled 



•ey, that 

 3ut vital 



r plants 

 . Ingeii- 



piratioi]:. 

 )th fides 



reas one 

 not the 



circum- 

 ed from 



y 



w 



hich 



•ed, they 



hem re- 



viiible ia 

 Vol. 11- 



eto 



their 



the fun 

 , not by 



jrfac 



e 



to 



tbs 



Sect. XIII. 1.5 



ELECTRICITY. 



^ai 



The o-reat ufe of all pl--^'^ mrnlno- their 



PP 



Eices of th 



h^t is thus intelligible ; the water perfpired from thof( 

 Traces is hyper-oxygenated ; and, as it efcapes from the (harp edgej 

 f the mouths of the perfpiring veffels, when aded upon by the h 



ht, aives out oxygen ; which oxygen, thus liberated from the per- 

 red water, and added to that of the common atmofpheie, prefents 



fpiratory terminations of the pulmonary arteries on the upper 



h 



with vital air. 



furfaces of leaves an atmofphere more repl 



This neceffity of light to the refpiration of vegetables is fo great,, 

 that there is reafon to believe, that many plants do not refpire during 

 the ni-ht, but exift in a torpid ftate like winter fleeping mfeas. 

 Thus "the mimofa, fenfible plant, and many others, clofe the upper 

 furfaces of their oppofite leaves together during the night, and thus 

 preclude them both from the air and light. And the internal fur- 

 faces of innumerable flowers, which are their refpiratory organs, are 

 clofed during the nisht, and thus unexpofed both to light and air. 



The fungi neverthelefs, which are 



med vegetables,- becaufc 



& 



th, or 



th 



fton 



they are fixed to the cz 



where they are found, can exift without light or much 

 pears in the truffle, which never appears above ground 

 funsi, which grow in 



or trees, or timber 



as ap 



dark 



and 



which are cultivated beneath beds of flraw. 



of their exifting without light, and from their fmell 



and by othe 



fculent muflirooms 



From this circumflanc 



> 



f 



al- 



kali, like burnt feath 

 when cooked and ea 

 kingdom 



hen they 



burnt 



they feem to approximate to^ th 



d from their taftc 



; animal 



5. Laftly. It may neverthelefs be fufpeaed,. that in many of the 

 periments of Dr. Prieftley and D 



Ingenh 



the produdlion of 



tal air might be (imply owing to the adion of the fun's light 



the water, in which the vegetables were immerfed, lik 



that from 



th 



filk in the experiment of Count Rumford 



and that th 



fi 



points, or (harp edges of thofe bodies, contributed only to facilitat 



th 



