sa csp 
Brongniart on Organized Remains. 7s 
least in the same formation. The specimens ought to be almost 
square—about three inches or more on a side, and one anda 
half thick. 
_ 5. It is equally important not to mix petrifactions found in 
different formations, or in different strata of the same forma- 
tion ; or, if they are packed together, to distinguish them by 
numbers, marks, or labels. - : 
When the preceding notices cannot be obtained, the first will 
suffice. — 
In order to collect the petrifactions, and to render them use- 
ful, it is not necessary to know them, nor to be perplexed to 
find them out; nor to be afraid of sending objects already © 
Known, or of little note. A part of the preceding indications, 
connected with the most common petrifactions, will always ren- 
der them useful. The important point, then, is, not to mix 
‘those which are found separate, nor to separate those which are 
found associated in the same stratum. 
This is easily attained, by designating by a common number, 
letter, or any sign whatever, one particular formation, or stra- 
tum, and by marking, with the same sign, all the petrifactions 
which are evidently found together. | 
The labels, designating the place, or the geological situation, 
may be placed in the papers which envelope the specimens, or a 
number, referring to an explanatory catalogue, may be attached 
toeach specimen. __ nits 
As far as possible, it is necessary to stick the labels or num- 
bers to the pieces, by pasting; and the surest way is, to write 
“pon the piece itself, 1st, the place where it is found ; 2d, the 
number by which it is indicated in the historical notes above 
requested. 
If there is not time to make out as many numbers or labels 
as there are pieces, it will be sufficient to unite, in one box or 
Packet, all the petrifactions of one particular stratum, and to 
designate them by a general label. 
tis necessary to pack the shells, and other fragile pieces, in 
Separate boxes, and to wrap each piece in a separate paper. 
M. Brongniart cannot allow himself to prefer such requests, 
€Xcept under the express condition that a memorandum of alt 
on. T.uNo. 1. 10 
