ANNOUNCEMENT. 
HOW TO WORK WITH THE MICROSCOPE. 
By LIONEL S. BEALE, F.R.S. 
The FIFTH EDITION, Enlarged to 530 pages, with too Plates, price 21s. 
\ strongly bound, is Now Ready. 
HARRISON, Pall Mall. 
Now Ready , 
THE SPECTROSCOPE IN MEDICINE. 
By Charles A. MacMunn, B.A., M.D. 
With 3 Chromo-Lithographic Plates of Physiological and Pathological 
Spedra, and 13 Wood Engravings, 8vo, 9s. 
Extract from Preface. 
“ The spedroscope seems likely to be of almost as great use in medicine as 
it has already proved in terrestrial, solar, and stellar chemistry. Hitherto, the 
great hindrances to its use have been erroneous ideas as to the difficulties 
which seem to surround this method of investigation ; such ideas having arisen 
trom want of a simple treatise on the instrument and its applications to 
physiology and pathology. The objed of this work is to supply the information 
needed.” 
Contents. 
C i? P The Prism and its Adion on Light— Construdion of a Spedroscope— 
the various kinds of Spedra. 
Instruments, and Methods of using them, &c. . 
The Application of the Study of Bright-line Spedra to Medicine. 
Physiological Absorption Spedra. 
Absorption Spedra of Blood (continued). ~ ... 
Easy Methods of preparing the most important of the Spedra which 
have been hitherto described ; and Application of these Methods. 
7. Absorption Spedra of Bile, Urine, &c. 
Appendix 1 — Remarks on Wave-lengths. 
„ 2— Bibliography. 
Index* 
London : J. and A. CHURCHILL, New Burlington Street . 
~~~ NOW READY. 
In One Volume, Demy 4to, Handsomely Bound in Cloth, with 18 Chromo and 
other Plates, Price £2 2s., 
AURORA, THEIR CHARACTERS & SPECTRA 
By J. RAND CAPRON, F.R.A.S., 
Part I.— THE AURORA AND ITS CHARACTERS. 
Part II —SPECTRUM OF THE AURORA. 
vLt III -MAGNETO-ELECTRIC EXPERIMENTS IN CONNEXION 
fart in. with THE AUR ora. 
BY THE SAME AUTHOR, 
Demy 8vo., Cloth, Piice £1 10s., 
PHOTOGRAPHED SPECTRA, 
136 Photographs of Metallic, Gase'ous, and other Spedra printed by the 
Permanent Autotype Process, with Introduction, Description of Plates, and 
Index. 
LONDON : 
E. and F. N. SPON, 46, Charing Cross. 
