STRONG DRINK AND TOBACCO SMOKE. 7 



or slices, of the various parts of the phints under con- 

 sideration, and in every instance they are intended to 

 represent their structure in a given direction. For 

 instance, in order to trace the growth of the barley 

 plant, we must begin by placing the seeds in moist 

 earth, or in water, for a day or two, and then watch 

 their germination, and the gradual development from 

 day to day of the young plants. The examination of 

 the tissues composing the leaves and the straw, in their 

 gradual development, will exhibit some most interest- 

 ing structures under the microscope. Carrying our re- 

 searches a step farther, the germs of the future flowers 

 of the plant may be easily discovered, and these traced 

 to their fructification and ultimate development into 

 mature seeds ; thus completing the cycle of the plant's 

 life from a seed to the seed again. So, again, with the 

 hop plant ; if the leaves and bracts of the fruit are 

 examined with a magnifying glass, our admiration is 

 immediately aroused by the beautiful form, colour, and 

 arrangement upon their surfaces, of thousands of minute 

 golden-coloured, granular bodies, which contain the 

 lupulite, so valuable to the brewer. 



Descendinor to the lowest recjion of vegetable life, we 

 have the yeast plant, whose marvellous development 

 from simple cells into long threads or filaments, by cell- 

 division and multiplication, may actually be Avatched on 

 the field of the microscope, when the plant is fed with a 

 solution of sugar. 



The external characters of tobacco leaves contrast 



