8 STRONG DRINK AND TOBACCO S3I0KE. 



curiously with those of other phmts. Interesting on 

 this account, they become even more so when examined 

 under the microscope. AVe then see the never-ending 

 variations which Nature elaborates in the internal struc- 

 ture of the leaves of plants, no less than in the form 

 and characters of the minute, invisible hairs with which 

 their surfaces are adorned ; these last serving us, even 

 when the leaves have been pounded to dust, as inf\illible 

 records of the plant which has produced them. 



In short, search where we will in Nature's laboratory, 

 her surjDrising variations of form, her myriad methods of 

 varying minutiae, excite our wonder at every stejD we 

 take in the endeavour to unravel these hidden Ijeauties. 



