CONTENTS. OF No. XLVII. 
I. Variation in the Obliquity of the Ecliptic. 
II. The Rights of the Thinker. 
III. Another View of Levitation. 
IV. The History of our Earth. 
V. Difficulties of ‘* Darwinism.” 
VI. The Mechanical Action of Light. 
NOTICES OF SCIENTIFIC WORKS. 
Fraser and Dewar’s “ The Crigin of Creation.” 
Cameron’s ‘‘ A Manual of Hygiene.” 
Crowell’s ‘The Identity of Primitive Christianity and Modern Spiritu- oe 
alism.” : 
Plympton’s ‘‘ The Blowpipe.” 
Greenwood’s “A Manual of Metallurgy.” 
Goldsworthy’s “‘ The Best Mining Machinery.” 
Girdlestone’s ‘‘ Number, a Link between Divine Intelligence and 
- Human.” 
Marcet’s ‘‘ An Experimental Inquiry into the Nutrition of Animal ; 
Tissues.” , 
Meunier’s ‘“‘ La Terre Vegetale.” as a 
“‘ Report of the Commissioners of Agriculture for the Year 1872.” 
“Report of the Sanitary Committee of the Board of Health on ae 
Concentration and Regulation of the Business of Slaughtering — 
Animals in the City of New York.” 3 
“The Safe Use of Steam.” 
Thcmson’s * Principes de Science Absolue.” 
“Holland’s * Fragmentary Papers on Science and Other Subjects.” 
Smith’s “On a Peculiar Fog seen in Iceland, and on Vesicular Vapour.” 
Collins’s “‘ Principles of Metal Mining.” 
McCoy’s “ Prodromus of the Paleontology of Victoria.” aes 
Keene’s ‘A Handbook of Hydrometry.”’ : Pe 
Churchill’s “‘ Consumption and Tuberculosis.” eee 
Sachs’s “ Text-Book of Botany, Morphological and Physiological.” 
Forbes’s ‘* The Transit of Venus.” 
Cox’s ‘“* The Province of Psychology.” 
Carpenter’s “ Principles of Mental Physiology.” 
Downing’s “ Elements of Praétical Hydraulics.” 
Downing’s “ Elements of Praétical Construction.” 
epee 
CoRRESPONDENCE.—The Pole Star and the Pointers. 
PROGRESS IN SCIENCE, 
(Including the Proceedings of Learned Societies at Home and Abroad, anes nee 
Notices of Recent Scientific Literature ). + 
