253 



tJombination, as yet undetermined, from that of the first, generiti 

 atom, — a composition attempted to be expressed thus :— 



C,,H,,N,0, = {C,,H,3N0 



And the appropriation of an alcohol hydrocarbon by this molecule 

 fjauses the production of an ammonium congener, which, in combina- 

 tion with some electro-negative element, may be thus written :— 



^42 ^22 ^^4 - ^ " yN + X, 



In conclusion, a tabular statement is made of the products analysed 

 in course of the investigation, with the termination ium for the bases,- 

 in analogy with ammonium : — 



Hydriodate of papaverine C^^ H^i ^^s ^^ 



Iodide of ethylo-strychnium C^g Hg^ Ng O^ I 



Hydratedoxideof do. crystallized C^g H^^ Ng O^ 0, HO, + 3 aq. 



Nitrate of do. ... C^g H27 Ng O^ NOg 



Bichromate do. dried at 212° C^g B.^^ Ng 0^ CrO^, HCrO^ 



Do. do. crystallized C^gH27N20^CrO^,HCrO^ + 2aq. 



Platinum salt do. ... 0^6^27 ^2 ^4 ^1' ^^ ^^2 



Bicarbonate do. do. dry C^g U^^ Ng O^ CO3, HCO3 



Chloride of amylo- | ^^.^ ^^ 212° C,^ H33 N^ O, CI, HO 

 strychnmm J 52 33 2 4 ' 



Do. do. crystallized C.^ H33 Ng 0^ CI. HO -f 7 aq. 



Nitrate of oxide do. dried at 212° C^^ Hgg Ng 0^ NOg, HO 



Do. do. crystallized Cg2 H33N2 O^NOg,HO + lOaq. 



Bichromate do. dried at 212° C^^ ^33 ^2 ^4 ^^^4' HCrO^. 



3. On the Mechanical Value of a Cubic Mile of Sunlight, 

 and on the possible density of the Luminiferous Medium. 

 By Professor William Thomson. 



The velocity of light being 192,000 miles per second, and the 

 mechanical value of sunlight incident perpendicularly on a square 



