320 MR C. G. WILLIAMS ON THE VOLATILE BASES 
Chinoline is the chief constituent of all the fractions boiling between 420° and 
470° F. (216—243° C.), in the twelfth rectification ; it is also contained in small 
quantity in the fractions a little below and above those points. 
In a case like the present, where the chief means of separation was distilla- 
tion, it was, of course, impossible to obtain the 18 and 20 carbon bases perfectly 
free from each other, and in bodies of so high an atomic weight, it was useless to 
attempt to prove their constitution by analyses of the bases themselves, as they 
only differ by *2 of a per cent. in the carbon, and when freed from those of the 
picoline series are extremely difficult to burn. 
As no doubt exists of the constitution of the double salt formed with chloride 
of platinum, and as the salts of the two bases differ in the amount of carbon they 
contain by two per cent., and, moreover, are readily obtained pure, I availed my- 
self of them to determine the fact of the existence of the two homologous bases 
in the fractions. 
The properties of chinoline and lepidine approach so nearly, that one descrip- 
tion will serve for both, less distinction being observable between them than is 
found to occur with a difference of C, H, in the other volatile bases. 
It is remarkable to find bases boiling at such extremely high temperatures 
give such well crystallized salts as those of chinoline and lepidine; even the 
portion boiling at 520° F. (271° C.) affords a fine platinum salt, almost in- 
soluble in water, and without the slightest tendency to assume a resinous or oily 
condition, as the salts obtained from bases with such high boiling points are so 
liable to do. 
As chinoline has so long been known, although not in a state of purity, I was 
satisfied, for the purposes of the present investigation, with determining the com- 
position of its platinum salt by the following analyses :— 
( 10-325 grains of platinochloride of chinoline boiling between 410° and 420° F, (210— 
215° C.), tenth rectification, gave 
zy) 12090... carbonic acid and 
*) 2880 ... water. 
4:280  ...  platinochloride of chinoline gave 
1:260  .., platinum. 
1. f 3530 grains of platinochloride of chinoline gave 
1:045  ... platinum. 
III 7°755 .., carbonic acid and 
1:550 Smt, water. 
9-900 grains of platinochloride of chinoline gave 
11805 ~...__—_ carbonic acid and 
2300 ... water. 
| 6:560 grains of platinochloride of chinoline gave 
wf 
3265 grains of platinochloride of chinoline boiling between 420° and 430° F, (216 
221° C.), eleventh rectification, gave 
‘960... platinum. 
