Report on London Bridge. — New University in Virginia. 317 



leisure to carry the design into effect. li" any gas is con- 

 densed, the temperature rises, and the elasticity is thereby in- 

 creased; but if a frigorific mixture is applied, it not only acts 

 by the abstraction of caloric, but also facilitates the applica- 

 tion of additional pressure. When a gas is suddenly con- 

 densed, a vapour seems to float in it for some time, whatever 

 be the nature of the gas. Mackenzie, in his valuable " Thou- 

 sand Experiments," suggests that this may be the matter of 

 light; is it not more probably part of the gas reduced to the 

 state of vapour ? B. 



MR. Telford's report on london bridge. 



The Bridge Committee of the Corporation of London having 

 caused observations to be made on the tide of the river Thames 

 at various stations, prior to the removal of the water-works and 

 the opening of the stopped arches, in order that a judgement 

 might be formed of the effect of removing the dam*, referred 

 the consideration of the subject to Mr. Telford, who has made 

 a Report, of which the following is an extract : 



" In regard to the effect which will be produced l)y the 

 enlargement of the Waterway of London Bridge — not having 

 obtained satisfactory data, I am not prepared to give an opinion 

 upon so important a matter ; the absence of satisfactory data 

 is in part attributable to the waterworks on the Surrey side 

 not being yet removed, nor the locks sufficiently opened, so 

 that the tidal observations on the upper or western portion of 

 the river are of course imperfect. 



" But even these tidal observations, if obtained, would be 

 very insufficient without an accurate survey of the river, its 

 shores and banks, &c. from London Bridge to the first lock at 

 Teddington ; and as I understand that no such document exists, 

 I consider it my duty to request authority to get this survey 

 made in a full and correct manner, since (without giving any 

 definite opinion upon the point) I have no hesitation in saying 

 that the removal of the existing dam w ill occasion a most im- 

 portjint change in the river westward of the bridge, and may 

 possibly affect the navigation and injure the property on both 

 its banks to a very serious extent." 



NEW UNIVERSITY IN VIRGINIA." 



An LTniversity has just been established for the State of Vir- 

 ginia by the venerable ex-president Jefferson, now approach- 

 ing his 80th year, at Charlotteville, near Monticello the place 

 of his residence. lie has expressed a hope, by selecting pro- 



* For tlic i>i)inioiis of Mr. Ware and Sir H. Englefield, sec above, 

 p. 2fh?. 



fessors 



