guage. This is just what a text-book should be.... The treatise
is certainly most useful, and bears internal evidence of being the
results of actual work in a busy manufactory and not of ephemeral
cramming in a technical school. The chapter arrangement is good, the
index satisfactory, and the book is altogether one which the
practical chemist should keep as accessible to his crucibles and
filter paper."--_Manchester_ _Courier._

* * * * *

=THE CHEMISTRY OF ESSENTIAL OILS AND ARTIFICIAL PERFUMES.= By ERNEST J.
PARRY, B.SC. (Lond.), F.I.C., F.C.S. Illustrated with Twenty Engravings.
400 pp. 1899. Demy 8vo. Price 12s. 6d.; India and Colonies, 13s. 6d.;
Other Countries, 15s.; strictly net.

=Contents.=

Chapters I., =The General Properties of Essential Oils.=--II.,
=Compounds occurring in Essential Oils.=--III., =The Preparation of
Essential Oils.=--IV., =The Analysis of Essential Oils.=--V.,
=Systematic Study of the Essential Oils.=--VI., =Terpeneless
Oils.=--VII., =The Chemistry of Artificial Perfumes.=--=Appendix:= Table
of Constants.

=Press Opinions.=

"There can be no doubt that the publication will take a high place
in the list of scientific text-books."--_London Argus_

"We can heartily recommend this volume to all interested in the
subject of essential oils from the scientific or the commercial
standpoint."--_British and Colonial Druggist._

"Mr. Parry has done good service in carefully collecting and
marshalling the results of the numerous researches published in
various parts of the world."--_Pharmaceutical Journal._

"At various times monographs have been printed by individual
workers, but it may safely be said that Mr. Parry is the first in
these latter days to deal with the subject in an adequate manner.
His book is well conceived and well written.... He is known to have
sound practical experience in analytical methods, and he has
apparently taken pains to make himself _au fait_ with the
commercial aspects of the subject."--_Chemist and Druggist._

"Mr. Parry's reputation as a scientist is fully established, and we
can therefore accept any work emanating from his pen as being of
the greatest practical value. We have perused the work before us
with much care, and are convinced that the contents will be found
most serviceable and its publication m