ROCK-FORMATION. 191 



tate clay fastest. Saline solutions faster than acid. Strong solutions 

 than weak. Hot solutions than cooler. Great amplitude of vibration 

 of molecules of water is suggested as explaining the effect of heat. The 

 note indicates the geological bearings of these facts. W. H. D. 



Rawlinson, Sir H. C. Address at the Anniversary Meeting of the 

 Hoy. Geogr. Society. Proc. Boy. Geogr. Soc. vol. xx. pp. 413, 414. 

 An account of Prof. Wyville Thomson's observations on the sea- 

 bottom of the Pacific, made on board the * Challenger.' 



Stewart, S. A. The Origin of the Greensand. Set. Goss. No. 136, 



pp. 81, 82. 

 An answer to Mr. Jukes-Browne's communication (see above). 



