CONTENTS. 



PAGE 



Art. I. The Theory of the Successive Geological Development 

 of Plants, from the earliest periods to our own 

 time, as deduced from Palseontological evidence, 213 



II. On the Mammoth Cave of Kentucky. By Professor 



B. SiLLiMAN Junior. From a Letter addressed 

 to Professor Guyot, Cambridge, dated Louisville, 

 November 8, 1850, .... 227 



III. Synopsis of Meteorological Observations made at the 



Observatory, Whitehaven, Cumberland, in the 

 Year 1850. By John Fletcher Miller, Esq., 

 F.R.S., F.B.A.S., Assoc. Inst. C.E., &c., . 234 



IV. Observations on the Teas of Commerce. By R. 



Warrington, Esq., F.C.S., . . . 240 



On Black and Green Teas, .... 242 



Adulteration and Sophistication of Teas, . . 246 



V. On the Geological Structure and Relation of the Fron- 

 tier Chain of Scotland. By the Rev. Professor 

 Sedgwick, F.R.S., &c., .... 250 



I. General Remarks on the Chain, . . 260 



II. Successive Groups in ascending order, . 261 



III. Concluding Remarks, . • . 256 



VI. On the Value of the Shells of MoUusca, for the pur- 

 pose of distinguishing Species and Higher Groups. 

 By Professor C. B. Adams, . . . 259 



