Editorial Comment. 343 
the Quaternary era in the most widely separated quarters of 
the globe, as, besides North America and Europe, in the Him- 
alayas, New Zealand, and Patagonia. 
For the two greatest glaciated areas, on the opposite sides 
of the North Atlantic, the Ozarkian uplift was ended by a 
general subsidence of the ice-burdened lands to levels some- 
what lower than now. This time is named the Champlain 
epoch, from the occurrence of its fossiliferous marine beds, 
overlying the till, in the basin of lake (];haniplain. On the 
borders of the ice-sheets, when the lands thus sank to their 
present hight or lower, a mild climate returned, with warm 
summers. The ice was melted fast away, assuming, however, 
steeper marginal slopes than before, and consequently acting 
with its maximum vigor in the amassing of marginal moraines 
whenever any temporary halt or slackening of its retreat was 
caused by secular changes of tlie average annual temperature 
and snowfall. 
The grandest monuments of the Ice age, in its moraine hills 
and ridges formed along the receding front of the continental 
ice-sheets, therefore belong to the Champlain epoch or closing 
stage of the Glacial period, when the depression of the land 
favored the mainly rapid, but at many times wavering or halt- 
ing, recession of the ice boundaries. 
EDITORIAL COMMENT. 
Natural Science. 
The January number of this vigorous English magazine is 
unusually interesting and valuable to American scientists. 
The English scientist is very inquisitive and has learned that 
in America are many interesting things. He reads American 
books and tells frequently what he thinks of them. He knows 
what American scientists are doing. It may be that the Eng- 
lish readers of American scientific papers, on any specified 
topic, are as numerous, and probably as appreciative, as Amer- 
ican readers of thcsame. It is for this reason that English 
reviews, published in English magazines, are sought for in 
America and that English magazines are so widely known 
and read in America. In the January number of N'atural 
