1122 
To show that the material of facts really admits of such a hypo- 
thesis. IT subjoin the values which must be assigned to the differences 
of energy of the equation 5, expressed in calories. 
Nitration of chlorobengene. Nitration of brombengene. 
= Se = 82 | EE = 
to ty 825 | ty ‘ty 647 
C= 0 t= — 30 | — t= — 30 
ere : Se ks: REY ie yee 
| | | | 
found cal. found’ cal. found | cel. |found| cal. 
ortho. 30.1 | 30.4 | 26.9 | 26.6 | ortho 37.7 | 37.7 | 34.4 | 34.3 | 
| | | | 
para 69.9 | 69.6 | 73.1 | 73.4 para | 62.3 | 62.3 | 65.6 | 65.7 
| | Fo >t al | 
Bromation of toluene. 
“th — ‘tp == 055 
| bte df 1 
| 
| 
found calc. found calc. found, calc. | 
| | | 
| 
| | 
sare 35.5 35.5 | 23.5 | 23.5 | 6.2 6.0 
para | 53.9 | 53.9 | 32.8 | 32.8 | 7.5 | vid 
Nitration of benzoic acid. 
| pa a0. FO | t=30 
calc. | found; calc. found calc. | 
18.4 | 22:39) 20.7 
‘found 
‘ortho | 14.4 | 15.9 | 18.5 
feta. 85.0. Bs 80.2 | 80:3 76.5 | 78.1 | 
Nitration of ethyl-benzoate. 
: == 500) 
ty tm 
t= — 40 LO he 0 
| 
bom Ee 
| found, calc. ‘found | calc. ‚found, calc, 
| 
ortho | 25.5 
meta | 73.2 | 73.7 | 68.4 | 69.2 | 66.4 | 65.6 
25.0 | 28.3 | 27.5 21.1 28.5 
hd 
