aha 
ee 211 
adult Mastodon is abeinidadiely testified by specimens now in nu- 
merous cabinets, including that of Mr. Koch’s, if we rightly re- 
member, and by reference to dates it would be easy to show, 
that I immediately announced its identity with the Mastodon, in 
a paper read before the American Philosophical Society in 1830, 
shortly after the appearance of Dr. Godman’s memoir. At first 
we had only noticed this additional tusk in the young animal, 
but in the following year, when on a visit to the University of 
Virginia, at Charlotteville, we were shown adult jaws with the 
same peculiarity, and published the fact in the “ American Month- 
ly Journal of Geology.” I beg to be understood, Messrs. Edi- 
tors, to make these comments on Dr. Owen’s remarks in good 
faith and kind feelings, and with the utmost deference to the 
opinions of my valued friend, Prof. Owen; but we are none of 
us immaculate. In all my investigations I have striven for truth 
and not for victory. Iam, therefore, not impatient of criticism ; 
on the contrary, when conducted in the manner of Dr. O., I 
court it, as subservient to truth and to the best interests of science. 
We are proud to bear testimony to the very general accuracy of 
his published facts; in matters of mere opinion, however, an 
honest difference must be anticipated. We are very willing to 
concede, that in most cases it will prove in the end that “it is 
not Homies nods, but we that sleep.” 
I sincerely hope that Prof. Owen will frequently favor the read 
ers of your important Journal with his valuable observations. — 
_T have the pata! to ape ene! —_ much oe fiend; 
Haran. 
Arr. X XIII.—Bibliographical Notices. 
1. Histoire Naturelle des Poissons d’ Eau Diwce de l’ Europe a 
trale ; par L. Agassiz. Embryologie des Salmones; par C. Voc 
Neuchatel, 1842. Planches.—M. Agassiz, in order to render his ex- 
cellent monograph on the fresh-water fishes of Central Europe as com- 
plete as possible, has determined to enter into the details of anatomical 
structure and development of the different natural families, which will 
come under his observation. To this end he has associated with him 
M. Vogt, the author of the present liyraison, comprising ‘‘ l’Embryolo- 
gie des Salmones.” ‘This is founded on the original observations of 
