206 



Comparative Analysis of Tea. 



matter in water and in alcohol, the weight of the precipitate by 

 isinglass, and the proportion of inert woody fibre in green and 

 black tea of various prices ; it is given, not as throwing any im- 

 portant light upon the cause of the different qualities of tea, but 

 as containing the results of actual experiments; it may also per- 

 haps save some trouble to future inquirers. 



Art. II. — On the Chart of Shetland. 

 M.D., F.R.S. 



Bl/J. M'CULLOCH, 



Having been lately engaged in a geological survey of the 

 Shetland islands, I had occasion to lament the deficiency which 

 British Geography labours under in the want of a map of this 

 district ; a want which was productive of considerable labour 

 and much uncertainty, and which eventually rendered it im- 

 possible to deduce any satisfactory conclusions respecting the 

 general direction of the strata, or the dependency and connexion 

 of those of a similar nature which were separated by wide in- 

 tervals. Had even the maritime outline been tolerably correct, 

 these difficulties would have been easily overcome, as the inte- 



