Letiers of Mr. Brongniart, with remarks, 225 
esemblances so striking, that often it would not be possible 
in a collection, to distinguish a psammite* or a compact 
limestone which came from England, from one, from the 
environs of Vinee or raf Rome, “provided the Jabels did-not 
give us infor anne as to the different laces. 
tain, and to prove that they exist at such great distances. 
“tis for you sir—it is for the numerous and well inform- 
ed ecologists, who inhabit the greater part of the —— 
States, to follow up these observations, and to put it in our 
power to compare, with precision, the  atnen dateiations 
with ours; with this view I have already sent to you, and to 
other rican naturalists, and I will continue to feat, 
suites of Eucapete a 
ou have also transmitted those that were, in this 
point of view, very interesting, and which I have already 
had the honour to acknowledge 
“T ask the continuance of these interesting relations, so 
useful to the. scie ignogs bad tm to true. > philosophy and so hon- 
pia Fa ae eS os: Sree sr os et 
upon a —— of organized bodies, , called tr . 
uo on the last year, from the Boys! ‘Academy of i 
-ences, an impression in plaster an American trilobite 
sent to the academy by Dr. David Hasacte of RcwsViock, and 
which came from the region of Albany. I pointed out in 
my report, the similiarity between the formations in which 
this fossil was found and. those in England, France, ee 
diderenee between that of M.Blumenbach and # 1a 
y—the x east which represented the 
was so ill defined, oe no exact er could be passed 
_— the differences or resemblances. 
siadeik eni 
this impression or’ Greathorasorendll of trilobite one of 
aeeentere sericea crane 
they were united by Mr 
is and i 2 >. +3, Pea a 
stor F 
2 
a 2... ‘No. 2 2. om 29 
