../ .\"., ////■,./ I/i.sfnri/. 



1'UM's were covered with tin toil, and the tour lateral faces were 



the same emissive and absorptive powers. For (lie fusible ma- 

 terials used to mark the temperature stear'me and Carnauba wax 

 were taken, melting at .">()° and 84° C. respectively. Two little 

 spheres of each (£""") were attached about the center of the 

 Miionth surface of the tin foil, making thus four indexes. The 

 Work of iron was kept successively at the temperatures 100°, 105°, 



noted when each little sphere melted; various precautions were 



The substances experimented upon were glass, iron, anhydrite, 

 and the exact weight, surface and thickness of the block taken was 

 accurately determined in each case ; as also the weight and surface 

 of the tin foil and the surface of the white lead. For each body 

 two series of curves were plotted, one of the temperatures and 

 times, the other of the thicknesses and times. The results show 

 that the method employed is capable of giving very accurate deter- 

 minations and those obtained agree very closely with the values 

 obtained by M. La garde on theoretical considerations. — Ann. 

 ''/ie/,1. Pln/'s., V, xxvi. 



II. Geology and Natural History. 





anges of level in the 



ference to facts from 



t he accounted for by 



hem simply a change 



3 the view sustained 



*eogr. Ges. Mitnchen, 





ns, and different for 



id position of the ice, 



<litr.-r.-nt localities, according to the 



-the following facts: that shell-beds near Dublh 



above the sea, and " it is difficult to see where the mass oi ice 



of land could have existed in Ireland to have exerted the requisi 



