Philosophical Tramactions, 101 



In another communication, printed in this part of the Transac- 

 tions, Sir Everard describes the organs of generation of the Mexi- 

 can Proteus, but the details of this paper require the plates to 

 render them intelligible ; they are engraved from Mr. Bauer's 

 exquisite drawings, and display some singular physiological pro- 

 visions. 



Additional Experiments^ and Observations, on the application 

 of Electrical Combinations to the preservation of the Cof/per 

 Sheathing of Ships, and to other purposes- By Sir H. Davy, Bart. 

 P.R.S. 



An abstract of this paper will be found at page 279 of our 

 seventeenth volume. 



On the Apparent Direction of Eyes in a Portrait, By W. H. Wol- 

 laston, M.D., V.P.R.S. 



Of this paper we have also already given some account. (Vol. 

 XVII. p. 274.) It is accompanied by several well-devised en- 

 gravings, which might, we think, furnish the basis of a series of 

 very amusing and instructive illustrations of the rules of per- 

 spective. 



Further Particulars of a Case of PneumatO'thorax. BifJ. Davy, 

 M.D., F.R.S. 



The details of this paper will be found in one of our preceding 

 numbers *. 



On the Action of finely' divided Platinum on Gaseous Mixtures, and 

 its Application to their Analysis. By William Henry, M.D., 

 F.R.S. 



The curious discovery of Professor Doebereiner, of Jena, respect- 

 ing the ignition of platinum, when in a spongy form, on the con- 

 tact of a mixture of oxygen and hydrogen, is well known to our 

 chemical readers ; and we have detailed, from the Annalcs de 

 Chimie, several interesting facts respecting it, ascertained by 

 MM. Dulong and Thenard. To these Dr. Henry has made some 

 important additions. 



The first section of his paper relates to the action of finely-di- 

 vided platinum on gaseous mixtures, at common temperatures, and 

 the second to its effect at increased temperatures ; of these results 

 an abstract has already been given in a former number of this 

 Journal t. 



• No. XXXIV. page 26S. t No. XXXIV page 277. 



