Professor Buckland’s Instructions, &c. 249 
iarly foliated and some specimens are translucent on 
the edges, but it is to be remarked, that neither the crys- 
talization or translucency are perfect, such as we see them 
in well characterized specimens of primary limestone. A 
farther examination has also disclosed to me organic petri- 
factions of madreporites, and other relics, very sparingly im- 
bedded, and sometimes not to be noticed for miles in sue- 
cession, even where the abrupt nature of the country ex- 
poses it to examination. The metalliferous formation is 
overlayed by a stratum of calcareous carbonate manifestly 
secondary, but this appears to have been much broken 
down, and washed away, as it is only seen capping bluffs 
and eminences 
As to the primitive region which I have described about 
the sources of the river St. Francis, > ev 
reliance upon it. It will be necessary, pa wever, carefully 
to distinguish the limits which I have fixed to this forma- 
tion, and which, I believe, are defined with sufficient pre- 
cision in the work. The rock here is red granite, consist- 
ing, mainly of feld spar and quartz, with very little mica. 
tis traversed by veins of Sta einen is _ ae 
laces rendered porphyrytic by large greenish and flesh- 
: . hae Y Of “ail these I sk ill 
easure in furnishing you duplicate, on my arrival at New- 
‘ork, in the spring, as my specimens are now there, and I 
shall have no means of access to them before that time 
Arr. IV. —* Instructions for conducting — Inves- 
Professor 
tigations, and collecting Specimens ; by 
Boextann, oof ee University of Oxfé coal “England. 
ce ted fo this Journal by Prof. Hare of Philadelphia 
ree et ee specimens a date te th he geology of ou 
country, one great esti aS ea those substances 
are of most common occurrence in it. 
Mr. 
* is, Vol. I. ..71) of this Journal, we published the instructions of 
Brongniart en. cting geological spec especially those ovare J 
remains. Wishing to give as wide x sinepntens as ee 
= ¢ ee om pociak snaiee: CORNET Ye: 
Saitoh: the ioe 3 of Professor Buc wat, Swe mistake 
will be found like those of Mr. Brongniart, to be drawn up with that s 
ich we migh ot from men sot subject. 
Vou. Til.....No. 2. 32 
