CONTENTS. 



Page. 



Introduction 7 



Effects of the various constituents of tiie ash on tiie Iturnins qualities of 



tobacco 14 



Potassium 15 



Calcium 16 



Magnesium 17 



Mineral and or^ranic acids 18 



The character of the ash 21 



The relation of the organic constituents to the burning qualities 22 



Summary 24 



Index 27 



105 



5 



