REVIEWS 193 
Finally the author discusses secular temperature changes as indi- 
cated by thermometric measurements made in the last roo or 150 years, 
and concludes that at Haparanda, Stockholm, and Lund, in Sweden, the 
January temperature has risen during this time 1° C., while that of 
August has become somewhat cooler. At Lund, April, June, Septem- 
ber, and October temperatures have remained unchanged. 
The paper contains five figures. One of these shows the fossil 
and present distribution of Hazel in Sweden. 
This article is particularly interesting to one who has previously 
read Chamberlin’s papers on the same questions. There are several 
points of coincidence in the two. One of the authors is a meteor- 
ologist, the other a geologist, by profession. On the main cause of 
long-periodic changes of climate both agree. In accounting for minor 
details the geologist favors meteorologic causes, while the meteor- 
ologist seems inclined to accept, with a modification, a hypothesis 
which has been quite generally favored among geologists. 
J. A. UDDEN. 
Sveriges temperaturforhallanden jamforda med det ofriga Europas. 
[The Temperature Conditions of Sweden compared with 
those of the rest of Europe.| By Nirs Exuorm, Ymer, 
Arg. 1899, H. 3, pp. 221-242. Published by Svenska 
Sallskapet for antropologi och geografi, Stockholm. 
The only portion of this paper that has obvious geological bearing 
is the statement that the temperature conditions of Sweden, especially 
the cold winters which sometimes occur, are to be explained rather by 
exceptional conditions favorable to radiation than by cold winds com- 
ing from Siberia. The author shows, among other things, that the 
recurrence of cold winters in Sweden exhibits a quite definite perio- 
dicity of five and two thirds years, or half the length of the sun-spot 
period. J. A. UDDEN. 
Physiography of the Chattanooga District in Tennessee, Georgia, and 
Alabama. By C. Witiarp Hayes. United States Geo- 
logical Survey. Part VII, Annual Report, 1897-8. 
In this report the author has done what Gilbert did in his ‘* Geol- 
ogy of the Henry Mountains,” namely, has made a study of a region 
