Preface 



XXXV. 



vinegar it is found better to make alcohol, 

 then, following Mr. Hudson still, we are to 

 get 4 gallons of juice per bag of 200 lb., or 

 twice the quantity discussed above, viz., 

 10,192,000 gallons, at 30. per gallon, giving 

 the planter 127,400 a year without any 

 trouble and expense to obtain ; whilst it will 

 probably save him both in getting rid of the 

 fluid in that way instead of his present one. 



All this, I know, is on paper, but that is 

 the proper place for every calculation to begin 

 with ; having thereby started the ball rolling 

 along the right channel, I leave it to the 

 readers of this book to see how far their 

 practice agrees with Mr. Hudson's figures and 

 my theory. 



I must not forget to thank M. Leplae, of 

 the Belgian Colonial Department at Brussels, 

 for the loan of the blocks out of their agri- 

 cultural bulletin, showing work in progress on 

 cacao estates in San Thome. These will be 

 found on pp. 36, 86, 94, 96, 108, and else- 

 where, and their inclusion has added con- 

 siderable interest to the explanations of the 

 various processes and apparatuses described 

 throughout the book. 



Since I started these notes, Mr. Fawcett 

 called my attention to a paragraph in the 

 Pharmaceutical Journal, of London, for 

 June 7, 1913 (p. 801), in which we are told 

 that 



" E. Perrot (in Comptes rend., 1913, 156, 



