Sect. IV. 1. 1. PULMONARY ARTERIES AND VEINS 



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SEC T. 



IV. 



THE PULMONARY ARTERIES AND VEINS OP VEGETABLES 



I. I . Leaves not per/piratory organs , nor excretory nor nutritious organs y nor ele5fri'c 

 nor luminous ones, 2. Vital air in the atmojphere, in ivater. Lungs of aerial 



animals j gills of 



3. Leaves are the lungs of vegetables. Arteries 



and veins vifihle in a leaf offpurge and picris coloured by madder, and in bloody 



^ r 



4. Upper furf ace only of the leaf refpires, and repels moijiure, and dies if 



dock 



Jmeared with oik and exhales much lefs than the under one, II. i. Aqi 

 are like the gills offijh ; have larger furf aceS^ as the uncombined oxygen 



lefs than 



divided like the leaves on high 



1. Are furnijhed 



with numerous points like gills offijh. 3. Which fet at liberty oxygen from foms 

 waters. III. 1. Koot-ltdiVQs of many plants differ from ft em-leaves, 2, As they 



4.. And 



produce only buds, 3 . T^hey differ as common leaves from floral leaves, 

 arife fomethnes from the cotyledons. 



IV. I. Floral leaves or bra5les 



•# 



organs to the calyx and pericarp, 1, In fome plants they do not app 



tiU the corol drops off, 3 . Recapitulation. Leaves die in the exhaufled 



V. I. The corol is a pulmonary organ 



colours, 



r 



afcular 



glands. Some flowers have no bra5fes, , The corol is not for def 



Tk 



corol of helleborus niger changes to a calyx, 3. Corol of colchicum and crocus fall 



off before the brakes appear 



bear alternate flowers and leaves. Fruit de 



prived of green leaves. 4. Vegetable uterus requires the bra£fes. Flowers enlarged 

 by deflroying the green leaves. 5. Plants do not refpire in their fleep. 6. Con'- 



iufh 



The anthers and ftigmas arefeparate vegetable beings j live on honey and 



acquire greater irritability, and amatorial fenfibih 



I 



There have been various opinions concerning the ufe of th 



leaves of plants in the vegetable economy. Some have contended 



they are perfpiratory 



o 



This does not appear probable from 



periment of Dr. Hales, Veg. Stat* p. 30. He found, by cutting off 



branches 



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