of the most needed organic chemical reagents.

On account of the impossibility of obtaining the less common
organic chemicals in the United States during the past few years,
university laboratories have had no option but to prepare their
own supplies. At the University of Illinois, for instance,
a special study has been made of this field, and methods for
the production of various substances have been investigated.
As a result, reliable methods and directions have been developed
for producing the materials in one-half to five pound lots.
Such work as Illinois has done is now being given an even more extensive
scope at the Research Laboratory of the Eastman Kodak Company. It is
felt that the results from these various laboratories should be
available to all chemists and it is hoped that they eventually
will be completely incorporated in these pamphlets.

The organic chemicals herein discussed have been quite
arbitrarily chosen, being those which have been needed in various
research laboratories in the last years and for which the directions
happen now to be ready for publication. The methods are in only
a few cases new ones; they are in general the most satisfactory
to be found in the literature. Only such details have been added
as will enable a man with a reasonable amount of experience
in organic chemistry to duplicate the results without difficulty.
To be absolutely sure that each set of directions can be repeated,
every experiment has been carried out in at least two laboratories.
Only after exact duplication of the results in both laboratories
are the directions considered ready for publication.
The names of the chemists who have studied the various experiments
are given so that further information concerning any obscure point