288 Intelligence and Miscellaneous Articles. 



islands which, appear to be raised reefs comparable "with those of 

 Barbados, and show that these reefs occur through the whole length 

 of the Antillean Chain, and indicate a recent elevation of at least 

 1300 feet, and in all probability of nearly 2000 feet. It appears 

 improbable that each island was a region of separate uplift, and as a 

 plateau of recent marine limestone also occurs in Yucatan, this 

 carries the region of elevation into Central America, and it is 

 reported that there are raised reefs in Colombia., The authors 

 conclude that there has been contemporaneous elevation of the whole 

 Andean Chain from Cape Horn to Tehuantepec and of the Antillean 

 Chain from Cuba to Barbados. Before this there must have been 

 free communication between the Atlantic and Pacific Oceans, which 

 is confirmed by the large number of Pacific forms in the Caribbean 

 Sea. Under such geographical conditions the great equatorial 

 current would pass into the Pacific, and there would be no Gulf 

 Stream in the North Atlantic. 



2. "The Shap Granite, and the Associated Igneous and Meta- 

 morphic Rocks." By Alfred Harker, Esq., M.A., E.G.S., and J. E. 

 Marr, Esq., M.A., Sec. G. S. 



The authors describe the normal granite of the intrusion, and 

 discuss the characters of certain variations from the usual type. 



The dykes and sills of the neighbourhood are also considered ; 

 the similarity of some of these to certain inclusions in the granite is 

 noticed ; and reasons are given for supposing that many of the 

 felsites and mica- traps of this region are connected with a magma 

 which was intruded amongst the Lower Palaeozoic rocks in pre- 

 Carboniferous times, and with which the Shap granite is itself 

 connected. 



The metamorphic effects of the granite upon the surrounding 

 rocks are then described. A remarkable set of changes produced in 

 a series of andesites and another of rhyolites, with their respective 

 pyroclastic rocks, is considered in detail, and the results of the 

 metamorphism of the Coniston Limestone series and the Coniston 

 Flags and Grits are given and compared with those obtained by other 

 workers in Norway, the Harz Mountains, and elsewhere. 



XX XIII. Intelligence and Miscellaneous Articles. 



OBSERVATIONS ON TEE PAPEE BY PROF. TROWBRIDGE, " MOTIONS 

 OF ATOMS IN THE ELECTRICAL DISCHARGE " (Phil. Mag. 



5th series, vol. xxx. p. 480, 1890). by e. Wiedemann and 

 h. ebert. 



HPO the paper of Prof. Trowbridge cited above, in which he proves 

 -*- that the molecules in electrical discharges possess no motion of 



