2l6 PLANT LIFE. 



increase his crop indefinitely ; that tobacco, wine, or 

 cheese of the most rare and precious character may be 

 formed everywhere, and with certainty ; that yeasts 

 and moulds might be utilised to turn sugar, water, and 

 a few cheap mineral salts into valuable food, as rich 

 and far more easily digested than beef or mutton. 

 None of these vistas seem at all impossible, if we 

 remember the advance made by Pasteur and Lister on 

 the achievements of their predecessors. 



