400 Peters—Elements of two Planets. 
even visited a party who, as he well knew, was collecting for 
our survey, and procured a collection from him. In his reply, 
he gives the reader to understand that he has refrained from 
describing Canadian species “ from a natural sense of propriety.” 
Where was this sense of propriety when he described the fossils 
from Cayuga, Canada West, in vol. iv, Pal. N.Y.; for instance, 
imputed to me. 
There is, besides the above, nothing in his reply but matter 
totally irrelative to the subject in dispute. 
Arr. XLVIIl.—Elements of Planets (122) and (128); by Prof. 
. H. F. Perers. From a letter to one of the editors, dated 
Litchfield Observatory of Hamilton College, Clinton, Oneida 
Co., N. Y., October 15, 1872. 
would be of little value. TI have, consequently, computed their 
orbits, for each selecting from the series of observations three 
positions suitably distributed. The elements, which, on account 
of the length of the area employed, may be assumed to possess 
already a great degree of reliability, result as follows: 
(122) Gerda, from obs. Aug. 1, Aug. 28, and Sept. 24. 
Epoch: 1872, August 28-0, Berlin mean time. 
M, = 112° 59’ 34-63 == 2° 5’ 28074 
m==208 12 1°76 pe = 6135218 
68 == 178 56 41°89 eas eq. 18720 log a = 05081178 
t= 1 36 16°85 
(123) Brunhilda, from obs. Aug. 1, Aug. 27, and Sept. 25. 
Epoch: 1872, August 27-0, Berlin mean time. 
M, = 267° 54’ 28-70 p = 6° 30! 2332 
We Tl GI 8208 pt = 8031187 
8 = 308 42 13-02 {mea eq. 1872°0 log a= 074301512 
(§o= 6 28 32°48 
