258 DR ANDERSON ON THE PRODUCTS OF THE 
6°373  ... of carbonic acid, and 
7850 grains dried in vacuo gave 
1:905 ... of water. 
3°112 grains gave 2°32 grains of chloride of silver. 


7684 ... gave 4:090 grains mercury. 
Experiment. Calculation. 
———_—_—_—_—_—_—<_——. 
Carbon, - 22-14 22:05 Ci, 84 
Hydrogen, . : 2-69 2°36 H, 9 
Nitrogen, . : noe 3°69 N 14 
Chlorine, . A 18-43 18°64 Cl, Ta 
Mercury, . : 53°22 53:26 Hg, 202 
100-00 380 
On another occasion results were obtained more nearly corresponding with 
the formula 3 Hg Cl+C,, H, N: and intermediate results were also obtained, but 
as the existence of these different compounds appeared to me to be fatal to their 
employment as a means of purifying the base, I did not attempt to pursue the 
subject further. The separation of lutidine from the other bases was also at- 
tempted by forming other salts, but none were found to answer, all being highly 
soluble except the carbazotate, which crystallizes in beautiful, long, yellow needles, 
a property which, however, is unfortunately possessed by the carbazotates of all 
the other bases. 
From all these experiments, it appears that I have been able to substantiate 
the existence of two bases, pyridine and lutidine, although it has been as yet 
impossible to obtain the bases themselves in a state of satisfactory purity. J am 
inclined, however, to think that the platinum salts, from their greater stability, 
and the ease and regularity with which they crystallize, will afford means of 
purification, but I have been hitherto deterred from trying this method on the 
large scale by the enormous quantity of platinum which would be requisite for 
the purpose. 
Tt appears, then, that Drprrt’s oil contains two series of bases, one that is 
homologous with ammonia, the other a series peculiar to that oil, homologous 
with one another, and remarkable for their isomerism with the series of which 
aniline is the type. Thus we have— 
Pyridine, . : 5 Capi Esl) 
Picoline, .. : : C,, H, N 5 ‘ : Aniline. 
Lutidine, . : ; Crate , ; , Toluidine. 
And it is probable that the series existing in Dipprt’s oil does not cease here, as I 
have found that the bases, with higher boiling points, give a steadily decreasing 
per-centage of platinum. It is impossible, in the present state of the investiga- 
tion, to give any opinion as to the intimate constitution and relations of these two 
groups of what I may call isohomologous bases. The most obvious explanation, 
however, would be to suppose the new bases to be imidogen or nitrile bases, 
