280 



Mr. G. F. Eodwell on the Effect of Heat on 



Marriott (William) Some Eemarks on the reduction of Barometric 

 headings. 8vo. London 1876. The Author. 



Miiller (Albert) Ueber das Auftreten der "Wanderheuschrecke am TJfer 

 des Bielersee's. 8vo. Luzern 1876. The Author. 



Nipher (E. E.) On the Yariation in the Strength o£ a Muscle. 8vo. 

 Neiu Haven 1875. On a new Eorm of Lantern G-alvanometer. 8vo. 

 1876. The Author. 



Oudemans (J. A. C.) Die Triangulation von Java, ausgefiihrt vom Per- 

 sonal des geographischen Dienstes in Mederlandisch Ost-Indien. 

 Abth. I. 4to. Batavia 1875. The Author. 



Putnam (F. W.) Archaeological Eesearches in Kentucky and Indiana. 

 1874. 8vo. Boston [U.S.'] 1875. The Author. 



Quetelet (Ern.) La Tempete du 12 Mars 1876. 8yo. Bruxelles. Etoiles 

 Filantes. Les Perseides en 1875. 8vo. Bruxelles. The Author. 



Salomons (Sir David) A K'ew Method of Signalling on Eailways. 8vo. 

 Tunlridge Wells 1875. The Author. 



Tiddeman (K. H.) The Work and Problems of the Yictoria-Cave Ex- 

 ploration. 8vo. Leeds 1875. The Author. 



Wallace (A. E.) The Geographical Distribution of Animals, mth a 

 Study of the relations of Li^dng and Extinct Faunas as elucidating 

 the past changes of the Earth's Surface. 2 vols. 8vo. London 1876. 



The Author. 



Warren (G. K.) An Essay concerning important physical features ex- 

 hibited in the Yalley of the Minnesota Eiver. 8vo. Washington 1874. 



The Author. 



Watson (J. Forbes) The Imperial Museum for India and the Colonies. 

 8vo. London 1876. The Author. 



'^^On tlie Effect of Heat on the Chloride^, Bromide, and Iodide 

 of Silver.^^ By G. F. Eodwell, F.E.A.S., F.C.S., Science 

 Master in Marlborough College. Communicated by Professor 

 Tyndall, F.R.S. Eeceived March 10, 1876^. 



In a former paper 1 1 endeavoured to prove that the iodide of silver is 

 capable of existing in three allotropic modifications, that it possesses a 

 point of maximum density at or about 116° C, and that if a mass of the 

 molten iodide be allowed to cool the following effects may be observed : — 

 (a) At the moment of solidification a very considerable contraction takes 

 place ; (/3) the solid on further cooling undergoes slight and regular con- 

 traction, after the manner of solid bodies in general, until (y ) at or about 

 * Eead May 4, 1876. See a/ate, ^. 4, t Proceedings, vol. xxiii. p. 97. 



