EE VIEWS. 
407 
do not obey the law of incidence and reflection, but 1 roll along tbe surface like 
a cloud of smoke/ it only increases tbe difficulty. Such a cloud, instead of 
returning to the coast of England, would in our case have rolled toward the 
coast of France.” It will be seen from the above that Professor Tyndall’s 
case is clearly and strongly put before the reader. Time alone will tell what 
result it may have on the expression of opinion in America. The other 
parts of the book are equally valuable if not of so absorbing interest. 
•INSTRUCTIONS FOR THE ARCTIC EXPEDITION.* 
H ERE is a vast and most valuable work, specially prepared for the 
Expedition which left our shores a few months since, and which, we 
doubt not, will well repay the expenditure which must have been made 
upon it by the Lords Commissioners of the Admiralty. It extends to 
more than 850 pp. of large 8vo, with numerous illustrations intercalated 
with the text, and it is divided into two distinct parts. The first division 
has to do with the instructions that were given to the several investigators 
who are sent out in the present Expedition. The second, which covers over 
750 pp., consists of a vast series of papers, collected and arranged by Pro- 
fessor Faipert Jones, F.R.S., and Professor W. G. Adams, F.R.S., and 
having to do with every possible branch of science which can in any way be 
brought to bear on Arctic matters. Finally, we may state that the entire, 
work has been brought out — and most successfully it seems to us — under 
the charge of Professor R. Jones, F.R.S., whose labours must have been of 
a most exhaustive description. And this must have been especially the case 
from the extremely short time allowed to get the work through the press 
from the period when it was first begun. On this account the reader will 
naturally excuse any slight errata he may observe, and he will pardon the 
manifestly incomplete character of the index, which, had time permitted, 
should have been a most full and exhaustive one. Indeed, on this point we 
think the editor should even now be permitted by the Lords of the Ad- 
miralty to produce an elaborate index, for there is nothing more requisite to 
insure the usefulness of the volume. 
So far as we can see, the information that is laid down in these instruc- 
tions is the most valuable and concise that can be conceived. The astro- 
nomical observations are placed first in order [alphabetical we suppose], and 
they include Notices of Eclipses of the Sun in 1876 and 1877, by Mr. J. R. 
Hind ; Suggestions for the Observations of Tides, by Professor Haughton ; 
Pendulum Observations, by Professor G. Stokes ; and Observations on the 
Detection of Meteoric Dust in the Snow, by Professor H. Roscoe. These are 
* “ Manual of the Natural History, Geology, and Physics of Greenland 
and the Neighbouring Regions.” Prepared for the use of the Arctic Expe- 
dition of 1875, under the direction of the Arctic Committee of the Royal 
Society, and Edited by Professor Rupert Jones, F.R.S. Together with In- 
structions for the use of the Expedition. London : Eyre & Spottiswoode, 
1875. 
