288 Notices respecting New Books. 
is a steadily growing demand for simple, non-mathematical accounts 
of both experimental results and their theoretical interpretation 
in the light of the new theory, and the demand is gradually being 
met. We heartily welcome the notable addition to this type of 
literature in the volume under review. The author writes in 
an easy and simple but deeply interesting style, and without 
burdening the reader with an excess of detail succeeds in presenting 
fully and clearly the general outline of his subject. The book is 
copiously illustrated, and contains a useful bibliographical appendix 
for those wishing to go more deeply into the subject. 
Karl Heumanns Anleitung zum Experimentieren bei Vorlesungen 
uber Anorganische Chemie. Von Prof. Dr. O. Ktuuine. Mit 
404 in den Text eingedruckten Abbildungen. Dritte Auflage. 
Braunschweig: F. Vieweg und Sohn. 1904. Pp. xxix+818. 
Tne art of arranging successful and instructive lecture experiments 
is not quite so easy to acquire as might at first sight be supposed, 
and perhaps nothing is more wasteful of time or more trying to 
the patience of the experimenter than the repeated failures of his 
efforts to exhibit some effect which, while easily perceived by a 
single person, is difficult to produce on a scale which will allow of its 
being readily detected by a large audience. To those whose duty it 
is to arrange for experimental illustrations of lectures on inorganic 
chemistry, we can warmly recommend the late Karl Heumann’s 
book, now edited and brought up to date by Prof. Kihling. In 
it they will find a most valuable guide; the thorough and syste- 
matic manner in which the subject is treated leaves little to be 
desired. 
In the introduction, the author deals with the designs of a 
chemical lecture-theatre, and considers in great detail the numerous 
arrangements required to ensure success and despatch in the carrying 
out of experiments. Next follows a section on glass-blowing, the 
treatment of cork and rubber stoppers,the removal of glass stoppers 
which have stuck fast, the collection of gases, the handling of liquid 
air, &c. The remaining portion of the book, which forms about 
seven-eighths of the total, is divided into two great sections, relating 
to experiments on the non-metallic and the metallic elements. 
Perfectly explicit directions are given for carrying out each experi- 
ment, and in most cases the apparatus employed is illustrated and 
fully described. The causes of failure are also very carefully 
considered, and various remedies and precautions suggested. To 
the professor or lecturer, as well as to his lecture assistant, the 
book should prove of inestimable value. 
