371 



their compounds with chinoline. Then follows a determination of 

 the vapour density of chinoline, and an examination of the action of 

 the iodides of the alcohol radicals on the base, and some of the pro- 

 ducts of the decomposition of the hydriodates of the ammonium 

 bases so formed. 



He also examines the chinoline series as it is obtained from coal- 

 tar, and proves the presence, in addition to chinoline, of lepidine, 

 and a new base, " cryptidine." 



In the course of the investigation, the following compounds were 

 analysed : — 



Platinum salt, chinoline, 



Gold, 



Palladium, 



Cadmium, 



Uranium, 



Nitrate of chinoline. 



Bichromate, . 



Binoxalate, . 



Platinimi salt, methyl-chinoline, 



Hydriodate ethyl-chinoline, . 



Platinum salt, ethyl-chinoline, 



Hydriodate amyl-chinoline, . 



Platinum salt, amyl-chinoline, 



Platinum salt, lepidine, from coal-tar 



Hydriodate ethyl-lepidine, . 



Platinum salt, ethyl-lepidine. 



Platinum salt, cryptidine, 



C18 H' N, Ha, + Pt Cl« 

 0^8 H' N, HCl, + Au Cl» 

 C'8 H' N, HCl, + Pd CI 

 C19 H' N, HCl, -f 2 Cd CI 

 C18 W N, HCl, + (U2 0^) a 

 C19 H' N, + NO^ HO 

 C'« H^ N, + 2 (Cr 0') HO 

 C18 H' N, + 2 (C^ 03 HO) 



c^» H* N, HCl, -I- Pt a« 



C" Hii N, -I- HI 



Q22 Hii N, HCl + Pt a* 



Q2B Jin N, HI 



c^s H'^ N, HCl + Pt a» 

 c^o H^ N, HCl + Pt a* 



Qu H" N, HI 



c" H>* N, Ha + Pt a^" 

 c" H" N, HCl + Pt a« 



3. On Fermat's Theorem. By H. Fox Talbot, Esq., F.R.S. 



The author gave a simple demonstration of the proposition, that 

 a" = t" + c" is impossible, when n>2, and either of the numbers, 

 o, b, c, a prime number. 



4. On the Transmission of the Actinic Rays of Light through 

 the Eye, and their relation to the Yellow Spot of the 

 Retina. By George Wilson, M.D. 



In 1849 the learned Swiss philosopher Wartmann stated, in his 

 " Deuxieme M^moire sur lo Daltonisme," p. 40, that " the eye 



