’ 
as 
j 
n 
K. Mobius in reply to Dr. Dawson's Criticism. 177 
an elevation mentioned by Loomis occurred in the warmer 
parts of thiscountry. If his theory finds favor, and the writer's 
conjecture is correct, it will be presumed that the three samples 
cited in the Handworterbuch from the still warmer regions 0 
the earth were taken in the midst of such a mass of cold air 
descending from, and retaining the composition of, the upper 
parts of the earth’s atmosph 
all sources. Whether the writer’s conjecture is correct or not, 
it has enabled him to select times for taking samples of air 
varying widely from the average ; and to such times his analy- 
ave been commonly limited, only occasionally including 
a sample of presumably normal air to serve as a check on the 
abnormal. 
Western Reserve College, Hudson, Ohio, June 12, 1879. 
Art. XXVIII.—Principal J. W. Dawson's criticism of my Mem- 
oir On the Structure of Kozoon Canadense compared with that of 
Foraminifera; by K. Méstus, Professor of Zoology at Kiel.* 
* For Dr. Dawson’s paper see this Journal, xvii, 196, March, 1879. 
[Thinking that Drobence Mobius should have, if he desired, an 0 fe 
y to Dr. Dawson’s criticism, and that science would profit thereby, we offe ; 
him the pages of this Journal, and stated that we should be pleased if he would 
occupy them and give his views on the subject; informing him, a ee —_ 
(in order to remove any objections that might arise in his mind), that there wou 
be no rejoinder in this Journal. Professor Mébius has accordingly prepared for 
us the article now published. J. D. D.J 
Am. Jour. Sc1.—Turrp Serres, Vou. XVIII, No. 105,—SEPT., 1879. 
12. 
