ii 



CONTENTS. 



VIII. Description of a New Detached Pendulum Escape- 

 ment; invented by Alexander Witherspoon, Watch- 

 maker, Tranent, .... 303 



IX. On the Occurrence of the Megalichthys in a Bed of 

 Cannel Coal in the West of Fifeshire, with Obser- 

 vations on the supposed Lacustrine Limestone at 

 Burdiehouse. By Leonard Horner, Esq. F. R. SS. 

 L. & E., Fellow of the Geological Society. Com- 

 municated by the Author, . . . 309 



X. Remarks on the Dublin and Kingstown Railway, in- 

 tended as a Supplement to a former Paper on the 

 Liverpool and Manchester Railway, Ia the 18th 

 Volume of this Journal, 1835. By David Ste- 

 venson, Esq., Civil-Engineer, Edinburgh. With a 

 Plate, ..... 320 



XI. Description of a Single Reflecting Microscope. By 

 Alex. Guthrie, Esq. Communicated through 

 J. Robison, Esq. Sec. R. S. E., . . 326 



XII. Notice of some minute Calculi found in the Urinary 

 Bladder of an Ox. By John Davy, M. D., F. R. S., 

 Assistant- Inspector of Army Hospitals, &c. Com- 

 municated by the Author, . . . 327 



XIII. On the Cause of the Temperature of Hot and Ther- 

 mal Springs ; and on the bearings of this subject, 

 as connected with the general question regarding 

 the Internal Temperature of the Earth. By Pro- 

 fessor GusTAv BiscHOF of Bouu. Communicated 

 by the Author, . . . .329 



Paet First. What Therm ometrical Circumstances on 



the Surface of the Earth lead us to assume that an In- 

 crease of Temperature towards the Centre of the Earth 

 must take place ? .... 329 



Chap. I.— On the Circumstances under which Warm 

 Springs are found on the Surface of the Earth, and 

 on their frequency of occurrence, . 330 



Chap. Il.-^Can the elevated temperature of Acidu- 

 lous Springs be a consequence of the absorption of 

 Carbonic Acid Gas ? . . . 336 



