8 



THE STOCKFEEDER'S COMPANION 



During sunlight the green colouring matter combines 

 the carbon and the water together with the liberation of 

 oxygen, which passes out by diffusion through the pores 

 on the under-side of the leaves. 



Upper layer of cells 

 (epidermis) 



Palisade parenchyma, 

 containing chlorophyll 

 grains, which give green 

 colour to leaf. 



Wood vessels which con- 

 duct water to the 

 leaves. 



Bast cells which conduct 

 carbohydrates, etc. , 

 from leaves. 



Open spaces or cavities 

 into which air is 

 admitted and carbon 

 dioxide gas absorbed. 



Lower epidermis. 



Stomata or openings 

 which admit air to 

 open spaces in leaf. 



Transverse section of small part of a leaf of a dicotyledonous plant, greatly 

 magnified, and rather diagrammatic. 



The starch (C 6 H 10 O 5 ) formed in the leaves is then 

 converted into sugar (C 6 H 12 O 6 ) by a ferment in the 

 leaf, and in this form diffuses or travels to those parts 

 of the plant where growth is taking place, or to be 

 stored up for future use, as in seeds, tubers, roots, 



