72 
ur 
The same order-(p > 0 > m) exists with the nitro-dimethyl- and 
diethyl-anilines and also in the nitro-toluidines. 
M-R. M-R. 
p-nitro-dimethyl-and-diethyl-aniline. . . . 3. . . 56,6 and 67,2 
o-nitro-dimethyl-aniline. …. . neee ey Me 
m-nitro-dimethyl-and-diethyl- niks woth Oi) Wee dS Dart Dasa 
3. nitro-ptolmidine. Lit, nde en ew ee es en ce = 
2. mijro-p-tolmiginie: … renten nae en Mies 
Relation between constitution and molecular-refraction proved to 
exist not only with the mono-nitro-anilines (toluidines), but also with 
those anilines (toluidines) which contained more than one nitro-group. 
For instance: of the 3.4-, 2.4- and 3.6-dinitro-dimethyl (diethyl)- 
anilines, the first possessed the largest, the last the smallest mole- 
cular-refraction. 
M-R. M-R. 
3.4-dinitro-dimethyl-and-diethyl-aniline . . .  .  . 62,8 and 73,1 
Bae hin 5 is A 5 Er DGR ed Dn 
86 ,, vs RORE en Aw te SBS Be 
The same order (2.4>>2.6) exists with the methyl and ethyl- 
derivatives. 
2.4-dinitro-methyl-and-ethyl-aniline. . …. . . … … 56,2 and 61,2 
il Bg on te) 5 A Er oe Pre ee Breet en ee 
~ 
With the dinitro-p-toluidines the position 2.5 gives larger molecular 
retraction than 2.3. 
2.5-dinitro-methyl-and-dimethyl-toluidine . . . . . 60,2 and 61,4 
Ae 5 a = é ay et pte eek he ce 59,6 
The irregular behaviour of the 3.5- and 2.6-dinitro-toluidines must 
be mentioned here, because it contrasts with these regularities. 
3.9-dinitro-toluidine and 3 5-dinitro-dimethyl-toluidine . 55,0 and 58.8 
oh ena Es = Meee Rite eee 5 E ‚ 4968 
With the trinitro-dimethyl (diethyl)-anilines [ examined, the com- 
pounds with the nitro-groups in the position 3.4.6 showed larger 
molecular. refraction than in 2.4.6. 
2 
3.4.6-trinitro-dimethyl-and-diethyl-aniline . . … …. . 68,2 and 77,5 
ADs PEREN eee LT 
On the strength of these determinations we may state that the 
molecular refraction of nitrated anilines and toluidines depends to « 
high degree on the position of the nitro-groups with respect to the 
amino-group. 
ctr 4 bb ’ 
a 
