UNDEKGKOUND PHENOMENA. 175 



The usual annual report on volcanic eruptions and earthquakes. The 

 year was marked by many severe disturbances. 97 earthquakes are 

 recorded. Many were undoubtedly connected with volcanic phenomena. 



F. W. 11. 



Fuchs, K. Theorie des Yolcans. liev. Sci. xi. pp. 10-14 ; 3 figs. 



An account of the ordinary structure of a volcano, the phenomena of 

 an eruption, and explanatory theories. In fusing sulphur under water 

 at high pressure miniature eruptions at the surface are produced during 

 solidification. E. B. T. 



Goll, Hermann. Les Mofettes de Schuols-Tarasp dans I'Engadine 



infeiieur. [The " Mofettes " of the Lower Engadine.] Bull. JSoc. 



Vaud. Sci. Nat. ser. 2, t. xiv. pp. 91-96. 



The " mofettes " are hoUows in metamorphic rocks, full of carbonic 



acid gas, and fatal to all small animals. An analysis of the gas by 



Prof. Bunsen is given. W. H. D. 



Hauslab, Gen. Inference applied to Geography, with special refer- 

 ence to Ocean Currents and the Arctic Kegions. Journ. 11. Geogr. 

 Soc. vol. xJv. pp. 34-45. 



By prolonging certain mountain-chains we can see that there existed 

 on the earth's surface annular chains like those on the moon (p. 39). 



Hennessy, Henry. On the Internal Fluidity of the Earth. Nature^ 



vol. XV. p. 78. 

 The theory of a solid nucleus is incompatible with physical laws. 



Herschel, A. S., and G. A. Lebour. Second Report of a Committee 

 on Experiments to determine the Thermal Conductivities of certain 

 Eocks. Mej). Brit. Assoc, for 1875, pp. 54-G2. 



A list of rocks in order of their conductive power, with their absolute 

 conductivities and resistances, is given. Opaque white quartz has most 

 conductivity, cannel coal least. It was found that porous rocks had 

 their conductivity increased by saturation with water. Some rocks 

 conduct heat more in some directions than in others ; it was found that 

 the resistance of slate to transmission of heat along the cleavage planes 

 is only half as great as that off'ered to its passage across them. In this 

 respect great differences have been observed in various schists. F. D. 



Judd, J. W. Contributions to the Study of Volcanos : On the Origin 

 of Lake Balaton in Hungary. Oeol. Mag. dec. ii. vol. iii. pp. 1- 

 15, x)l. 1. 

 Proves that Lake Balaton is due to subsidence after volcanic erup- 

 tion, and, like L. Neagh and possibly the Victoria Nyanza, could not 

 liave been eroded by ice-action. Movements of the earth's crust arc 

 constantly occurring ; and hollows so formed during the Glacial period 

 would be preserved by the ice preventing silting-up. Denies the power 

 of glaciers to excavate lake-basins. W. H. I). 



. Contributions to the Study of Volcanos. 2nd Series : On tho 



