s^ 



^'■gan 



ti'iUS 



> 



e 



Previ, 

 ion to 



I it 



^vhich 



in th 



c 



s 



icdarie 



^ntaiiied 

 oxygen, 



^ colchl- 



pericarp 



enfuincT 



^11 leave 



3 



p and Its 

 1 as that 

 he floral 



y plants 

 And in 



name 



the ex 



,.1 



> 



') 



which 



rgena 



nece 



ted. 



e 



ffary 

 Ad 



ter. 



lity» 



nate 

 . flow 



an 

 the 



ers- 



Sect. IV. 5. i 



AND VEINS. 



5^ 



of vegetables are th^.. .^.^^ 



1. They 



fift of an artery, which 



carries 



fap to the extreme furface of the upper fide of the leaf 

 and there expofes it under a thin moift pellicle to the adion of the air ; 

 and of veins, w^hich there collea and return it to the foot-ftalk of ' 

 leaf, like the pulmonary fyftem 



f animals 



I 



this organ th 



pellucid fap is changed to a coloured blood, like the chyle in paffi 



The leaves of aquatic plants 



through the lungs of animals. 3 



furnifhed with a larger furface, and with points 



like the gills 



of 



aquatic animals 

 like the larynx of 



4 



The upper fides of 



pel moiftur 



5. Leaves are killed by fmearing them 

 with oil which in the fame manner deftroys infeds by (lopping th 



fpiracula, or the air-holes to their lung 

 appropri 



6. Leaves have mufcl 



ated to turn them to the light, which is neceffary 



th 



refpiration, as 

 may be added 

 He put an in 

 and it foon perifhed 



be fli 



the Sed 



on 



Light. 



7 



T 



th 



experiment of Mr. Papin related by M. Duhamel 



plant into the exhaufted receiver of an air-pump 



; but on keeping the whole plant in this vacuun 



except the leaves, which were expofed to the air, it continued 

 a loner time, which he adds is a proof that the leaves are the 



of refpi 



V. I 



Phyfic des arbres, V. I. p. 1 69 



The oro-ans of refpiration already defcribed confift of th 



o 



leaves belonging to leaf-biid 



d of the bra£les belo 



a"'o 



flower-bud 



But there is another pulmonary fyftem totally ind 



pendent of the green foliage, which belongs to the fexual or amatorial 



parts 



of the frudlification only, I mean the corol or petal 



In th 



there is an artery belonging to each petal, which conveys the 



o 



blc blood to its extremit 

 delicate moift membran 



pofing it to the light and air undc 



the internal furface of the pe 



here it often changes its colour, as is beautifully feen in fome party 



ed poppies, though it is probabl 



fome of the irridefc 



of flowers may be owing to the different degrees of tenuity 



H 2 



of 



:he 



leav^^ 



