12. 
13. 
14, 
19. 
CONTENTS. 
PAGE 
Saltpetre. 5, Artificial Formation of Minerals 
by Igneous Action. 6, The Use of the Micro- 
scope to Mineralogists, : ° 365-367 
GEOLOGY. 
. Earthquake Indicator. 8. The quantity of 
Solid Matter carried annually to the Sea, 
9. Origin of the Bitumen of Stratified Rocks. 
10, Strength and Density of Building Stone. 
11. Theory of Earthquakes, ; . wO7—OT2 
ETHNOLOGY. 
Agassiz on the Specific Difference of the Hu- 
man Races, ; , ; ee yp 
METEOROLOGY. 
The importance of correct Scientific Instru- 
ments at Sea, > ; : : 372 
BOTANY. 
The Age of the Cypress Forests. 15. The 
Effect of Coloured Light on Germination. 
16. Origin of the Wheat Plant. 17. A New 
Invention for increasing the Produce of 
Autumn Wheat. By M. D’Urcle, 18. The 
Preservation of the Soil, : - “S78=a76 
ASTRONOMY. 
The Present State of Astronomy, / 376 
MISCELLANEOUS. 
. New Method of procuring Coloured Silk from 
the Cocoons. 21. The Value of Polarization 
to thej Optician and Glass Manufacturer. 
22, Practical Value of the Optical characters 
of Sugar. 23. Polarized Light used in de- 
tecting Vinous Fermentation. 24. The use of 
Polarized Light as a Test for Sugar. 25. The 
Value of the Microscope for detecting the best 
kinds of Wool for Felting. 26. Present State 
of Agriculture, : : 377-379 
New Publications received, . ; . o19 
INDEX, 
381 
