Action of the Flame of Alcohol upon Palladium. 35 



4 + 3 + 1 =8 (or, what is the same thing, it is 9 — 1, the 

 corner-total less the number immediately above it). The tree 

 forms corresponding to the numbers 1, 2, 1 ; 2, 1 ; 1 in the 

 body of the Table are the trees 2 to 9 in the figure, p. 258. 



The numbers of the radicals C n H 2w+1 , as obtained from the 

 Table in the manner just explained, are: — 



Jl = 



1 



Number of radicals G n H 2 „ +1 . 



1 





= 1 



Methyl. 



2 



1 





1 



Ethyl. 



3 



1 





1 



Propyl. 



4 



4 





4 



Butyls. 



5 



9 



- 1 



8 



Amyls. 



6 



18 



- 1 



17 



Hexyls. 



7 



42 



- 3 



39 



Heptyls. 



8 



96 



- 7 



89 



Octyls. 



9 



229 



- 18 



211 



Nonyls. 



10 



549 



- 42 



507 



Decyls. 



11 



1346 



-108 



1238 



Undecyls. 



12 



3326 



-269 



3057 



Dodecyls. 



13 



8329 



-691 



7638 



Tridecyls. 



The question next in order, that of the determination of the 

 number of the bivalent radicals G n H 2n , might be solved with- 

 out much difficulty. 



Cambridge, November 20, 1876. 



IY. Note on the Action of the Flame of Alcohol upon the Metal 

 Palladium. By Professor Wohlek, For. Mem. R.S. fyc* 



N the year 1824 I published! the observation that palla- 

 dium, both in the spongy form and in that of foil, pos- 

 sesses the property of becoming gradually covered with a thick 

 coating of carbon when held in the flame of a spirit-lamp. A 

 small piece of palladium sponge thus heated swells up to many 

 times its own volume, cauliflower-like bunches of carbon being 

 deposited on the surface of the metal. The same phenomenon 

 is observed if the metal be allowed to glow in a coal-gas flame. 

 When the adhering porous mass of carbon is allowed to burn 

 away, a fine skeleton of palladium remains behind ; and this 

 is the case even if the carbon has been deposited upon a piece 



* Translated by Professor Eoscoe from the Gottinger Nachichten, 

 No. 20, 1876. 



t Pogg. Arm. vol. iii. p. 71. 



D 2 



