SOLAR PHYSICS. 
By A. H. SWINTON, 
Member of the Entomological Societies of London, New York, 
and Stettin ; Correspondent U.S. Ent. Commission, &c. 
Price 7 s. 6d., in Ornamental Cover, Illustrated. 
“ The table of Sun Cycles is explained, and with a clear apprehension of 
this the reader can post himself up in knowledge, the mere idea of which would 
have stunned his ancestors.” — Surrey Advertiser. 
“Allow the Sun spots to have a definitely recurrent period of increase and 
decrease, many observers have traced a corresponding cycle in the occurrence 
of heat-waves, earthquakes, tempests, floods, abundant crops, inroads of 
destrudlive insedts, & c.” — yournal of Science. 
“ Mr. Swinton has here expended on this research an immense amount of 
time and labour. The influence of the solar spots has been suspedted by the 
greatest minds of the age.’’ — Liverpool Mercury. 
“ The subjedt is one of great interest, and is deserving of public attention.” 
— Glasgozv Evening Times. 
London : W. H. ALLEN & CO. 
Monthly, One Shilling. Post free, 14s. per annum. 
THE 
ILLUSTRATED SCIENCE MONTHLY. 
A Popular Magazine of Knowledge, Research, Travel, and Invention. 
Edited by J. A. WESTWOOD OLIVER. 
Contains articles by the most eminent writers on Economics, Geography 
and Travel, Rural Affairs, Gardening, Farming, Forestry. Health, Astronomy, 
and Meteorology, Mathematics, Physics, Photography, Chemistry, Microscopy, 
Botany, Entomology, Zoology, Anthropology, Geology, Archaeology, Numis- 
matics, Engineering, Technology. Amateur Mechanics, Turnery. Workshop 
Appliances, Novelties of Invention; and deals, in fadt, with ever}- branch of 
Science in the widest sense of the term. 
New Books are reviewed, and an exhaustive “ Chronicle of Science ” places 
on record all interesting items of news. A portrait of an eminent “ Leader of 
Science is given each month, together with a brief biography. A department 
under a responsible editor is devoted to Chess. 
The Illustrations are made a special feature, being more profuse in number 
and beautiful in execution than has ever before been attempted in a scientific 
periodical. 
“Full of scientific interest, and especially remarkable for the clearness ana beauty of its 
illustrations.” — Illustrated London News. 
“ Carefully edited, well arranged, aud comprehensive.” — Queen. 
“ One of the best and most valuable of the journals devoted to Science .”— Newcastle Cliron-. 
“ The contributors are of the first rank, and the subjects are treated in a popular manner. 
— Munches er Evening News. 
*• A more invitirg magazine v:e have rarely seen ''—N.B. Daily Mail. 
“ The best and cheapest science periodical published ." — Modern Society. 
Volume I., handsomely bound in cloth, price 6s. 
London: DAVID BOGUE, 3, St. Martin’s Place, Trafalga r Square. 
To Authors, Editors, Lecturers, Publishers, &c. 
M ANUSCRIPTS prepared for Press. Compilations, Abstracts, and 
Critiques supplied. 
Foreign Scientific Works, Memoirs, Patent-Specifications, &c., 
translated. 
Special facilities for Biology in all its branches, and for Chemical Tech- 
nology. 
Distinguished References. 
Address, “ Confidence,” Office of the yournal of Science, 3, Horse-Shoe 
Court. Ludgate Hill. E.C. 
fcs-' All communications respecting the Advertisement Department to be addressed 
to Mr. THOMAS BLYTON.nf the Office, 3, Horse Shoe Court, Ludgate 
Hill, London, E.C. - 
