192 PHYSICAL GEOLOGY. 



that the facts point to an * aqueous ' metamorphism as the cause that 

 many masses of rock which one would have expected to show traces of 

 life are Azoic ; and thus he considers the discoveries of the * Challenger ' 

 expedition support the doctrine of uniformitarianism in accounting for 

 the gaps in the record of organic evolution. F. D. 



Huxley, Prof. T. H. On the recent Work of the ' Challenger ' Ex- 

 pedition, and its Bearing on Geological Problems. Proc. R. Inst. 

 vol. vii. pp. 354-357. 



To the same effect as the above. 



LeboTir, G. A. On the Deposits now forming in British Seas. 

 Proc. Geol. Assoc, vol. iv. no. 3, pp. 158-164. 



Chiefly an account of Delesse's book so far as it relates to British Seas. 

 The areas of bare rock are described ; then the marine, fluvio-marine, 

 and shore deposits. Of chemical deposits the seas in question give no 

 good examples. The distribution of the materials is believed to be 

 fairly constant. W. T. 



Le Conte, Prof. Joseph. Eate of Growth of Corals. Amer. Journ. 

 ser. 3, vol. x. pp. 34-36. 



Records observations made among the Florida reefs. Concludes that 

 the annual growth of madrepore-points in the gulf is not more than 

 3| to 4 inches per annum. G. A. L. 



Papier, A. Sur Tagglutination par la mer de certains sables et cail- 

 loux de quartz des environs de Bone. [The cementing by the sea 

 of certain sands and quartz -pebbles near Bone.] Bull. Soc. Geol. 

 France, 3 ser. t. iii. pp. 46-48. 



Thinks this cementing due to a kind of siliceous varnish deposited 

 by the sea under the influence of very rapid evaporation. 



Parfitt, E. On the Decay of Limestone fragments imbedded in the 

 New Red Sandstone Cliffs on the coast of South Devon. Trans. 

 Devon. Assoc, vol. vii. pp. 325-328. 

 Draws a comparison between the results of deep-sea soundings ob- 

 tained by the naturalists of the 'Challenger' and the conditions 

 under which -the New Red Sandstone of South Devon would appear to 

 have been deposited. In each case there is mud highly charged with 

 red oxide of iron ; and its presence would cause any calcareous matter 

 to be rapidly dissolved. T. M. H. 



Riviere, A. Note sur I'origine des calcaires. [Origin of Lime- 

 stones.] Compt. Rend. t. Ixxx. pp. 1596, 1597. 



In the early times of the earth's history, the atmosphere being 

 charged with various volatilized substances, the condensation and the 

 precipitation of calcareous matter took place after a lowering of the 

 temperature both of the atmosphere and of the earth. • G. A. L. 



Stewart, S. A. The Greensand and its Origin. 8ci. Goss. no. 131, 



p. 243. 

 Controverts the view that the Greensand is formed of casts of 



