This treatise, which is more or less technical, will be followed by a 

 more popular one giving the substance of Dr. Loew's investigations in 

 connection with some temperature studies which have been made in 

 the fermenting piles of tobacco in Florida and Connecticut. 1 respect- 

 fully recommend that the manuscript herewith submitted be published 

 as Eeport No. 59 of the Department. 

 Respectfully, 



MiLTO]^ Whitney, 



Chief of Division^ 

 In Charge of Tobacco Investigation^^. 

 Hon. James Wilson, 



Secretary of Agricidture, 



