AKD COMPOSITION IN OEG-ANIC COMPOUNDS. 
273 
=^Xl9°. The temperatures of ebullition quoted in the following Tables under the 
head “ assumed,” thus calculated, pretty nearly coincide with the results of observation. 
Primary monamines : 
Table XXIV. 
Assumed. 
Observed boiling-point. 
N ... 
Aniline 
179 
Hofmann, 182°; Kopp, 185°. 
N ... 
Toluidine 
198 
Muspratt and Hofmann, 198°. 
^16 Hu ^ 
Xylidine 
217 
Church, 213°— 214°. 
C,H,3N ... 
Cumidine 
236 
Nicholson, 225°. 
C,oH,3N ... 
Cymidine 
255 
Barlow, about 250°. 
Secondary monamines : 
Table. XXV. 
Assumed. 
Observed boiling-point. 
CuH^ N ... 
Methyl-aniline 
185 
Hofmann, 192°. 
Hofmann, 204°. 
Morley and Abel, 217°. 
c"h;jN ... 
Ethyl-aniline 
204 
c"h;;n ... 
Ethyl-toluidine 
223 
c"h;. N ... 
242 
C,3H,-N ... 
Amyl-aniline 
261 
Hofmann, 258°. 
Tertiary monamines : 
Table XXVI. 
Assumed. 
Observed boiling-point. 
V„H, N ... 
Pyridine 
O 
115 
Anderson, 115°. 
0,3 H, N ... 
Picoline 
134 
Anderson, 135°. 
C^H, N ... 
Lutidine 
153 
Anderson, 154°; Williams, 160° — 165°. 
VeH„N ... 
Collidine 
172 
Anderson, 179°; Williams, 179° — 182°. 
C,„H„N ... 
191 
c::h;;n ... 
Diethyl-aniline 
210 
Hofmann, 213°*5. 
C3,H.,N ... 
Diethyl-toluidine 
229 
Morley and Abel, 229°. 
C,. H,. N ... 
248 
c::h:;n ... 
Ethyl-amyl-aniline 
267 
Hofmann, 262°. 
The isomeric bases CnHn.jN, belonging to different classes, have different boiling- 
points. The discrepancies are by no means great in the case of the isomeric terms of 
the primary and secondary monamines, but considerable enough in the case of the 
tertiary monamines compared with the two previous classes, so that the bases belonging 
to the third class may be distinctly recognized. Dimethyl aniline may be expected to 
exhibit the same boiling-point as collidine, isomeric with it, and likewise a tertiary 
monamine. 
The relation mentioned (page 261), viz. that for certain classes of alcohols, acids and 
ethers, a boiling-point a;Xl4°'5 higher or lower corresponds to .:rC more or less in the 
formula, is in general not observed on comparing the bases of the first and second class ; 
but the boiling-points of a large number of tertiary monamines, such as they are calcu- 
lated from the (assumed) boiling-points of the last Table, coincide tolerably well with 
the results of observation. 
2 0 
MDCCCLX. 
