الفهرس 
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Abstract
In the whole realm of orGea-dc chemistry, there is no reactioii the accacre-ace of which c4i be relied upon, more Certainty than the formation of a caiazo--compound, by the action of nitrous acid on a primary aromatic amine .
_a in S reaction Can
The Ger-’-a_i-”-Y and sooth_aess with which th-4 L -L
be accomplished under appropriate conditio.-,as, coupled with the high reach-Va-ty of the resulting diazo-compound, make it c4ie of -the u~Lios-[J- value, alike to the manufacturer of chemicals oii a large scale, acid to the chemist g enaged in
C)
(la
aroh). initiati .,c- ripple of the whole tide of
:cese The
human ever-Y which has since been e,,<,..Dende,_r’ in the study of L)
these coapounds was released. at g Maxbur L-1 the year 1856,
Marburg
when Peter Griess(2) first had in hard a specimen of di¬a.zotised piGroar..ic acid a~id recognised it. as a member of a hitherto unIaiown class of chemical co-,,qpow_idls.
A. number of distinct ways of T,)roduci_-,-.S- the diazo- .b) - t’ dominates U
Co pounds(i are Icaownj but one o: hem so dominates the others that t--ey are of trifling importance
I I portaiice by comparison. The do-miiia~at reaction by which the d_-Lazo compounds are for¬med is expressed i2. its simplest and most --eneral wad-