456 REPORT—1883. 
The latter type (II.),in which a phenol residue is indicated by the abbreviation 
Ph, comprises such bodies as the phenol-bidiazobenzene, 
0H, .N=N 
CH. "NEN? CHs - HO, 
of Griess. These bodies have recently been studied by Wallach, who terms them 
diazo-compounds, 
Secondary bodies of the first type (I.) are generally derived from amidoazo- 
compounds. A series of secondary diazo-compounds of the general formula 
, N=N-—Ph 
R<w_=N—Ph 
have been prepared by Wallach by the following method: A diamine is first 
operated upon, so as to acidulate one of its amido-groups, and the free amido-group 
is then diazotised and combined with a phenol. The acid radical is then eliminated 
and the liberated NH, group diazotised and again combined with a phenol. The 
series of operations is thus shown :— 
NH NH . 0,11,0 NH, ¢ N=NPh 
R<ya, E<yin.’Ph R<yiwi pr «| PSNen Ph 
The author then proceeded to give a preliminary account of some experiments 
which he had been engaged upon, with the object of obtaining secondary and. 
tertiary compounds by a new method. The starting-point in this new process is a 
nitro-derivative of an amidoazo-compound, or of an azo-phenol :— 
NO,.R.N=N-R.NH,, NO,.R-N=N-—Ph, 
i; ie 
The nitro-group is reduced without breaking up the diazo-group, and the amido- 
group diazotised and combined with a phenol, thus giving rise to tertiary or second- 
ary compounds :— 
Ph N=N Ry. N=N.oRie N=N. Ph, and), PhaN—N Re Need: 
I. Il. 
Tn illustration of the paper the author exhibited a series of dyed fabrics illus- 
trating all the principal types of the best known commercial products, and specimens 
of the new secondary and tertiary compounds obtained in the course of the present 
research. 
3. Suggestions for computing the Speed of Chemical Reaction. 
By Professor Rosert B. WarpDER. 
Among the published determinations of the speed of chemical action, some have 
already been discussed in connection with the ‘ action of mass,’ thermo-chemistry,. 
electromotive force, and statical determinations of chemical affinity. In many 
cases, however, a series of experiments is recorded, showing how far a certain re- 
action progressed in a certain interval of time, with no attempt to reduce the 
results to a common standard, or to render them available for quantitative study 
in relation to other researches. A thorough discussion of all reliable data is very 
desirable— 
1. To discover and investigate the causes of certain discrepancies between 
published observations and the current theories ; 
2. To afford more definite information of the nature of certain reactions, and 
the conditions that determine their speed ; 
3. To afford numerical data for a fuller study of the relations between speed of 
reaction and other physical constants; and 
4, To suggest fruitful lines for further researches in chemical dynamics. 
Among the most interesting achievements in modern organic chemistry are 
Prof. Menschutkin’s determinations of the speed and limits of the etherification of 
the several classes of alcohols and acids; and yet the published numbers, expressing: 
the ‘initial speed’ (Anfangsgeschwindigkeit) or the extent of the reaction reached 
