150 Intelligence and Miscellaneous Articles, 



2. " On some Recent Borings through the Lower Cretaceous 

 Strata in East Lincolnshire." By A. J". Jukes-Browne, Esq., 

 B.A., F.G.S. 



The borings described in this paper are at Alford, Willoughby, 

 and Skegness, and disclose the existence of an unsuspected anticlinal 

 axis bringing up Lower Cretaceous rocks beneath the Drift. In the 

 Willoughby boring, beneath the Drift, a brown sand was obtained, 

 apparently the ' Roach ' division of the Lower Cretaceous, and below 

 it the Tealby Clays (108 feet), oolitic ferruginous beds (18 feet), 

 and sandstone and sand regarded as the Spilsby Sandstone. In the 

 Alford boring the highest solid rock appears to belong to the basal 

 beds of the Red Chalk, and below it is Carstone, and then clay. 



The axis of the anticlinal appears to pass between Alford and the 

 border of the Wolds, and is probably continued in a north-westerly 

 direction beyond the village of Claythorpe. 



The result of the information now obtained makes it probable 

 that the Chalk tract which lies to the south-east of the Calceby 

 valley is completely isolated from the rest of the Chalk area. 



XIV. Intelligence and Miscellaneous Articles. 



SOME CORRECTIONS TO A PAPER ON THE LAWS OF MOLECULAR 



FORCE. 



To the Editors of the Philosophical Magazine and Journal. 

 Gentlemen, 



TXTITH your permission I should like to make some corrections 

 * * in my paper on the Laws of Molecular Eorce, published in the 

 Philosophical Magazine for March of this year. In Section 2, 

 page 222, it is stated that the equation for element gases is almost 

 identical with that of Van der Waals but is a little simpler. This 

 is a mistake, for the equation is absolutely that of Tan der Waals. 

 At the end of Section 4 and in Section 5 and elsewhere, the term 

 which in the characteristic equation contains the absolute tempera- 

 ture T as a factor is spoken of as the kinetic-energy term, and is 

 assumed to represent kinetic energy. This is an error, for the 

 term includes also the virial of the forces called into play during 

 the collisions of molecules. To anyone who has read my paper on 

 a Kinetic Theory of Solids (Phil. Mag. December 1891) the error 

 will appear a strange one, seeing that the Virial of the collisional 

 forces is there treated as of fundamental importance; but the 

 paper on Solids, though published before that on Molecular Eorce, 

 was written after it, and circumstances prevented my correcting 

 the mistake in the earlier paper before it was read at the Physical 

 Society and published in the Philosophical Magazine. Section 5 

 is so much affected by the error that I wish it to be considered as 



