J. Hall on a question of Priority. 105 
Lower Silurian age, contain in some places staurolite crystals. 
Percival first noticed the fact, and states this even of the rocks 
of Mt. Washington, the main part of the Taconic range. He 
speaks of the rock of “ Taconic mountain” as fine-grained mica- 
ceous or talco-micaceous schist, containing garnet and staurolite ; 
and adds, “sometimes it is greenish and subchloritic, with 
seams and patches of compact green chlorite, and yet accom- 
panied with the same minerals [garnets and staurolites]. This 
18 particularly the case in the south and northeast part of Ta- 
coni¢ mountain.” Hence staurolites, and chlorite also, occur 
in rocks admitted to be Silurian. 
-) Mr. Hunt denies that he makes, in his Address, “ the 
crystalline schists of the White Mountains a newer series than 
the Green Mountain rocks.”—I had read on pages 29 and 33 of 
the Address approving announcements that Macfarlane had 
made the crystalline rocks of the Green Mountains Huronian ; 
and then, on page 84 of the Address, the statement that the 
White Mountain series is largely developed in Newfoundland, 
and that this fact had led him (Mr. — to propose for it [the 
year before] the name of the Jerranovan System. At this point 
Mm the Address there is a referenve to this Journal of the pre- 
ceding year, vol. 1, p. 87, 1870; and consequently by referring 
ck to this article by Mr. Hunt, I found this Terranovan de- 
fined, Mr. Hunt saying that, according to Mr. Murray, the serie’ 
Comprises “ aavetal thomnaie feet of strata, including soft bluish- 
ray mica slates and micaceous limestones belonging to the 
otsdam group, besides a great mass of whitish granitoid mica 
Slates whose relation to the Potsdam is still uncertain.” 
Huronian is older than the Potsdam, and this equivalency of the 
‘tranovan is not corrected in the Address, I thought I had 
reason for supposing that Mr. Hunt made the White Mountain 
Series the newer. I acknowledge I prefer the view he now 
Presents, since the less definite the statement the better as long 
48 we have no sufficient facts for a conclusion. 
— 
Arr. XVII.— Reply to a “ Note on a question of Priority ;"* by 
James HALL. 
Iv the April number of this Journal there is published an 
article with the above title, in which the author questions the 
fact of publication of a small pamphlet entitled “Notes on 
Some new or imperfectly known forms among the Brachio- 
oe perhaps owe to myself and to the scientific public a 
few words in reply. 
ey E. B nestion, essentially in the same 
Srl ad manera to or more arses the Canada’ Natural 
