188 PHYSICAL GEOLOGY. 



Vezian, A. Les periodes glaciaires et les causes de leur apparition. 

 [Glacial periods, &c.] ' Rev. Sci. xi. pp. 536-543. 



Reviews the various explanations of recurring glacial periods, adopt- 

 ing that of the unequal distribution of heat in space in which the solar 

 system is moving. E. B. T. 



See also : — 



Ramsay, Prof. A. C. Anglesey .: p. 31. 



■ . The Dee : p. 32. 



Tyndall, Prof. J. Parallel Roads of Glen Roy : p. 3: 



