IS STROyO BRINK JXI) TOBACCO SMOKE. 



are protruding from the end of the grain, having burst 

 throuoli its husk. In two or three days more, if we 

 remove the husk from another grain, v.e find a tough, 

 ahnost horny structure, to which the little remaining 

 mealy part of the grain most tenaciously adheres (fig. 3). 

 This body is called the cotyledon or embryonic leaf. 

 Growing as it were from this, and attached to it, is a 

 small greenish conical body, another young leaf, whilst 

 the extension in growth of the horny mass downwards 

 forms the basis from which the young rootlets grow 

 into the earth (Plate 2, figs. 4, 5). In a day or two, 

 a still further development of the plant is seen ; by re- 

 moving the upper leaf, another still younger is found 

 to have grown from the stem within it (fig. 6). 



It will be observed, that one important feature of the 



plant's structure is illustrated in the growth of the 



leaves one icithin another, each younger one forcing the 



older one next to it in an outward direction. Fig. 7 



represents a young plant about nine days old, removed 



bodily from the soil. The husk of the grain is still 



adhering slightly to the plant, but when this is removed 



(fig. 8), the contents of the grain are found to have 



undergone an entire change ; instead of the white mealy 



mass which it once contained, its place is occupied by 



the bases of the leaves, and the tough horny substance 



to which these and the rootlets are fixed. The fact is, 



that the embryo, whilst growing, and forming rootlets 



and leaves, has evidently done so at the expense of the 



mealy portion of the grain — a beautiful provision that 



