a A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE 
“To the solid ground 
Of Nature trusts the mind which butlds for aye.” —WORDSWORTH 
NOx3 Ea. 
Registered for Transmission Abroad] 
THURSDAY, DECEMBER 23, 1869 
[All Rights are Reserved 
Fourth and very much enlarged Edition, 70 Plates, 4 Coloured, 2rs. 
HOW TO WORK WITH THE MICRO- 
SCOPE. By Dr. LIONEL BEALE, F R.S. 
HARRISON, Pall Mall. 
NEW WORK BY DR. BEALE, F.R.S. 
Now ready, 5s. 62. 
PROTOPLASM;; or, MATTER, FORCE, 
and LIFE. 
JOHN CHURCHILL & SONS, 
Now ready, crown 8vo. 3s. 6d. 
HANDBOOK OF PHYSICAL GEOGRA- 
PHY. By KEITH JOHNSTON, Jun., F.R.G.S. 
W. & A. K. JOHNSTON, Edinburgh, and 74, Strand, London. 
Neatly half-bound, eighteenpence. 
WHITAKER’S ALMANACK FOR 1870. 
The best, most complete, and cheapest Almanack published. 
To be had of all Booksellers and Stationers. 
THE ACADEMY. The Third Number 
of “THE ACADEMY,” a New Literary Review and Monthly Record of 
Literature, Learning, Science, and Art, published THIS DAY, contains, 
besides papers of literary and scientific information, an unpublished letter of 
SIR ISAAC NEWTON, 
JOHN MURRAY, Albemarle Street. 
BYRON’S POETICAL WORKS. 
Now ready, post 8vo. price Half-a-Crown. 
THE PEARL BYRON; Being a New 
and Copyright Edition of the Complete POETICAL WORKS of LORD 
BYRON, collated and revised from the Author’s MSS. 
The Pall Mall Gazette. 
“This PEARL EDITION of LORD BYRON’S WORKS is certainly 
the most remarkable reprint. For HALF-a-CROWN may now be hada 
complete and faithful collection of the poet’s works. 
““The BEST EDITION of BYRON 7s xow brought within the means of 
the poorest student of the English classics.” 
JOHN MURRAY, Albemarle Street. 
Mr. DURR of LEIPZIG has been ap- 
pointed Agent to the Publishers of ‘““‘NATURE” for GERMANY and 
EASTERN EUROPE. Books ror Review, Orpers, and ADVERTISE- 
MENTS may be forwarded direct to him. Address: ALrHons Durr, Leipzig, 
Germany. 
WORT 
ROYAL INSTITUTION OF GREAT 
BRITAIN, Albemarle Street, W.—PROFESSOR TYNDALL, LL.D., 
F.R.S., will commence a Course of Six Lectures (adapted to a Juvenile 
Auditory), ‘On LIGHT,” on TUESDAY, December 28th, at Three 
o'clock. Payment for this course, One Guinea. (Children under 16, Half- 
a-Guinea) ; for all the Courses in the Season, Two Guineas. 
December, 1869. H. BENCE JONES, Hon, See. 
THE UNIVERSE; or, the Infinitely Great 
and the Infinitely Little. By F. A. POUCHET, M.D. Illustrated by 343 
Engravings on Wood, of which 73 are full-page size, and 4 Coloured Plates. 
Handsomely bound, gilt top, 31s. 6d. 
“We can honestly commend the work, which is as admirable as it is 
copiously illustrated.”— Times. 
BLACKIE & SON, 44, Paternoster Row. 
+ 325 
In crown 8vo. price 
SYMBOLISM; or, MIND, MATTER, 
LANGUAGE, as the Elements of Thinking and Reasoning, and as the 
Necessary Factors of Human Knowledge. By JAMES HAIG, M.A. 
WILLIAM BLACKWOOD & SONS, Edinburgh and London. 
Im Verlage von GEORGE WESTERMANN in Braunschweig ist soeben 
erschienen : 
DIE SPECTRALANALYSE in IHRER 
ANWENDUNG AUF DIE STOFFE DER ERDE UND DIE NATUR 
der HIMMELSKORPER,. Gemeinfasslich dargestellt von Dr. H. SCHEL- 
LEN, Director der Realschule erster Ordnung zu Céln. Mit 158 erlauternden 
Figuren in Holzschnitt, 2 farbigen Spectraltafeln und den Portrats von 
Bunsen, Kirchhoff, Secchi, und Huggins, gr. 8. geh. Fein Velinpap. 
Preis 3 Thlr. 20 Sgr. 
No. I, on January 1, 1870, price One Shilling (to be continued monthly 
until completed in One Volume), 
MICROSCOPIC OBJECTS, Figured and 
Described by JOHN H. MARTIN, Secretary to the Maidstone and Mid- 
Kent Natural History Society. 
JOHN VAN VOORST, 1, Paternoster Row. 
NEW CHEMICAL CLASS-BOOK. 
Now ready, 100 Illustrations, small 8vo. 4s. 6d. 
CHEMISTRY for SCHOOLS: an Intro- 
duction to the Practical Study of Chemistry. By C. HAUGHTON GILL, 
Assistant-Examiner in Chemist:y at the University of London, late Teacher 
of Chemistry in University College School. 
London: JAMES WALTON, Bookseller and Publisher to University 
College, 137, Gower Street. 
: NOTICE. 
ILLUSTRATED TRAVELS.—Monthly 
PART for JANUARY (Part 13, price One Shilling). Edited by H. W. 
BATES, Assistant-Secretary of the Royal Geographical Society, contains a 
most interesting paper on the Pacific Railroad, by FRED. WHYMPER. 
(Now ready.) 
CASSELL, PETTER, & GALPIN, and all Booksellers. 
a 
