Intelligence and Miscellaneous Articles. 221 



sandstone lenticles in the marl in South Nottinghamshire develop 

 into a definite bed of sandrock, called the Lower Mottled Sandstone, 

 At first, a thin Upper Magnesian Limestone is found below a dimin- 

 ished representative of the Lower Mottled Sandstone ; but, on 

 following the outcrop northwards, the Upper Limestone is seen to 

 grow in importance and the Lower Mottled to diminish, until, in 

 South Yorkshire, it is not found. 



The Permian rocks continue to increase in thickness and the 

 Banter to diminish, until the Pebble Beds also become unrecog- 

 nizable, in North Yorkshire. Also the Middle Marl now fails, and 

 a thick mass of limestone remains to represent the Permian. The 

 Keuper Waterstones persist throughout, and seem to be slightly 

 unconformable to the Bunter. 



From these considerations it is believed that the Upper Magnesian 

 Limestone and Upper Marl of the northern part of the outcrop are 

 the time equivalents of the Bunter of South Nottinghamshire, 

 the one being deposited in an inland sea, comparable with the 

 Caspian, the other along the coast-line, which was slowly moving 

 northwards. 



The palaeontology of the Upper Magnesian Limestone is dis- 

 cussed, and the evidence derivable from the fossils is shown to be 

 not unfavourable to the above view. 



XXIII. Intelligence and Miscellaneous Articles. 



ON THE EQUATION OF CONTINUITY OF THE LIQUID AND 

 GASEOUS STATES OF MATTER. 



To the. Editors of the Philosophical Magazine. 



Gentlemen, — Moscow, May 11th, 1911. 



IN the article " On the Equation of Continuity of the Liquid 

 and Gaseous States of Matter," printed in the Phil. Mag. 

 October 1910, Mr. Kleeman gives an empirical relation between 

 the internal latent heat of evaporation L and the densities of a 

 substance j o 1 and p 2 resp. in the liquid and gaseous state. The 

 relation consists in that the function 



^ 2 ^ 2 



Pi ~?2 



is approximately constant for each substance (p. 678 sqq.). 



I venture to point out that this relation was found out by me in 

 1904, and published in the Annalen der Physik, vol. xiv. p. 305 sqq. 



I beg to remain, 



Yours truly, 



A. Batschinski. 



Privat-docent of the University of Moscow. 



