J. D. Dana—Notice of Hunt's Essays. 105 
regular envelopment, (enveloppemens avee orientation) from the 
eudomorphs with which, although having nothing in common 
with them, they had been associated. In connection, I took oc- 
i mark that it seemed to me an analogous error, when 
all gneisses, amphibolites, and so on, are regarded as metamorphic 
and not originally-formed rocks; and that the confounding of the 
two ideas of pseudomorphism and metamorphism has had many 
ere are cases of envelopment which may be regarded as pseudo- 
ok provided the form of the enveloped crystal is still recog- 
nizable, 
as well as results of a simultaneous and original crystallization, or 
that this view of mine is identical with that proposed by himself in 
the year 1853.* 
othing but an incomprehensible misunderstanding can explain 
such an opinion, which, moreover, has been already sufficiently 
disposed of by Dana in the American Journal of Science for Feb- 
mary and August of 1872. Cart NauMANN. 
In Mr. Hunt's new book that letter to Delesse is again ap- 
Pealed to, to show that Naumann holds what he rejects, and 
what every one who is acquainted with his Mineralogy knows 
that he has never held ; for the work does not contain a word 
envelopment” in the chapter on Pseudomorphism, and 
both in that chapter and elsewhere he presents the ordinarily 
accepted view. Naumann’s note to the Jahrbuch was not 
called out by anything I had written him; I never addressed 
4 letter on the subject to anyone in Europe. 
a Hunt endeavors to make out that Naumann knew the con- 
ar: . his Address only through my ‘misleading criticisms, 
Dyed at therefore his letter is not to be taken as meaning what 
ri a ut Naumann, after giving his view of his own letter, 
ea ly precise in his statement of Mr. Hunt's doctrine. ore- 
fore hi ann shows that he did have Mr. Hunt's writings be- 
en 1m; for he refers to Mr. Hunt's views in “ 1853,” as quoted 
follow, ottence of Mr. Hunt's, published in 1853, which is here referred to, is as 
inated ;; © generally admitted notions of pseudomorphism seem to have orig- 
to find it in — re led to seek for some more simple a corpse ~ 
us and room — in the association and crystallizing together of homol- 
Tphous species.”—Am. J. Sci., I, xvi, 218.—Ebs. 
