AMERICAN JOURNAL OF SCIENCE. 
[THIRD SERIES] 
Arr. XIL—Examination of Mr. Alfred BR. Wallace's Modifica- 
hon of the Physical Theory of Secular Ohanges of Climate ; by 
James Crow, LL.D., F.R.S.* 
ON the publication of ‘Island Life,’ upwards of three years 
ago, the author kindly favored me with a copy. He at the 
same time wrote to me stating that the volume contained some 
modifications of my theory of secular changes of climate, to 
the last few months. This fact will account for the appear- 
ance of the following remarks at this somewhat late date. 
ave read the chapters relating to Geological Climate with 
nevertheless implied in the theory. Other points, again, re- 
garded as modifications are simply facts lying nitogesOpe out- 
Side of the theory, which can in no way affect it. V 
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