60 MINUTE MARVELS OF NATURE 



blowing hard, they produce horrid, squeaky 

 noises. This, however, does not amount to 

 scientific investigation of the structure of plants; 

 and, resisting the temptation to make squeaky 



* 39- P art of a section of the blade of a laurel leaf to show 

 its internal structure 



noises with the skin of the leaf, we find below it 

 a series of regular, closely packed green cells. 

 These give the green colour to the leaf, being 

 seen through the transparent layer above. They 

 are called the "palisade cells," and their green 



