er ects 
1862, On one of the two copies received here is written (in a hand 
writing which I do not recognize) the words “ Published Nov. 1861.” 
he sheet. noticed by Dr. Dawson was sent him by Prof. Hall in No- 
vember or December. It is quite clear therefore that this publication 
is antedated at least 11 or 12 months. In November, 1861, I published 
that the species is neither an Obolus nor a Lingula. Any person in 
many of the costly works published by the enlightened policy of many — 
of the state governments of the United States would lose much of their 
authority. Whenever any of those dates prove to be erroneous I shall 
not hesitate to state it, as I have a perfect right to do, in the most 
public manner. E. B. 
Montreal, March 24th, 1862. — 
3. Correction of the Article on the Red Sandrock in this vol., p.100; by 
E. Bruurxes.—In my paper on the Red Sandrock of Vermont, (this vol. 
p. 100) I have inadvertently said that Barrande first determined the age 
of the Georgia slates. My attention has been since called to this’ 
to me while writing the article. I should have said that with the excep- 
tion of Dr. Emmons, Barrande w : 
™mon’s opinion four or five years ago. Col. E. Jewett of the Geological 
Museum of the State of New York, wrote me several letters in 1857 and 
i of the trilobites for examina- 
views that the fossils had a true primordial as In the winter of 1860 
I brought them under Barrande’s no ice as constituting with some others 
I said nothing to him 
a primordial colony in the Hudson River group. 4 sale 
about the Taconic question, and I ‘ncluded in the supposed colony three 
ies of Tri de immediately replied that he did not 
think it a colony. While his letter was on the way we discov 
