TWENTY-FIRST YEAR OF PUBLICATION. 
THE 
I, 
AND ANNALS OF 
ASTRONOMY, BIOLOGY, GEOLOGY, INDUSTRIAL ARTS, 
MANUFACTURES, AND TECHNOLOGY. 
(MONTHLY, FORMERLY “THE QUARTERLY JOURNAL OF SCIENCE.”) 
Vol. VI. (series) 
No. CXXVII. 
J'TTIj'Y" 
1884 . 
CONTENTS 
PAGE 
Articles. 
1. The Domestic Animals in the 
“ Pile-Dwellings ” of the 
Biebr Lake 377 
2. What is Religion ? Hylo- 
Idealism ? By S. Billing. . 382 
3. The Sand Martin and its Mi- 
grations. By Rev. Samuel 
Barber 397 
4. On Electricity and its Present 
Applications. By W. Fraser, 
A.M., M.R.C.S. Eng 399 
5. The Origin of Species from 
Mongrels between Races and 
other Species 409 
6. The Health Exhibition .. .. 412 
Articles — continued 
7. The Extraction of Gold.. 
PAGE 
416 
Analyses of Books. 
The Wonders of Plant-Life under 
the Microscope 424 
Longman’s Magazine 426 
Twelfth Annual Report of the 
United States Geological and 
Geographical Survey of the 
Territories 427 
Bulletin of the Philosophical So- 
ciety of Washington .. .. 429 
&c., &c. 
Correspondence 434 
Notes 437 
LONDON : 
% 
HORSE-SHOEXQURT, LUDGATE HILL 
Where Communications for the Edith} ii^Books for Review may be addressed. *1 
1 1 1 
PRICE ONE SHILLING AND SIXPENCE 
