Questions of Growth and Driftage — Testimony of a 

 Block of Coal under the Microscope — Different 

 Kinds of Coal — Conditions Necessary to Accumu- 

 lation in situ — Coal Beds and their Accompani- 

 ments — Underclays and Roofs — Vegetable Remains 

 — History of Coal Groups — Summary of Evidence — 

 Subsidence of Coal Areas— Stigmaria and other 

 Coal Plants — Later Coal Accumulations — The 

 Story and Uses of Coal 



