89 
[Marcou. 
Georgia rocks have been accepted by Mr. Walcott to the detri- 
ment of those of Mr. Marcou.” 
For priority of suggestion and correctness of date of early publi- 
cations, my claim contained in my joint paper with Barrande be- 
fore the Boston Society, preceded Mr. Hitchcock by at least ten 
months. 
As to the descriptions and sections of the typical and original 
fossiliferous area of the Georgia slates, Mr. Hitchcock has never 
published anything about it, even to this day ; and the only ones we 
have are (1) my description in the Proc. Boston Soc. Nat. History, 
Vol. viii, December, 1861, and (2) a more complete description 
with all the details and figures of the celebrated Parker’s quarry 
in 1880 (‘Bulletin Soc. geol. France,’ tome ix, pp. 23-24, Paris) , and 
in 1887 “ The Taconic of Georgia,” etc. (‘Memoirs Boston Soc. 
Nat. Hist.,’ Vol. iv, pp. 112-113). In 1886, Mr. C. D. Walcott 
also published a description of the Georgia slates, at Georgia 
township, with a figure of a section on pp. 15-16, in his paper 
entitled : “ Second Contribution to the studies of the Cambrian 
faunas” (‘Bulletin U. S. Geol. Surv.,’ No. 30). 
The priority of suggestion, as well as of description of the 
“Georgia slates” at their original and typical area, belongs to me 
and not to Mr. Hitchcock. 
Mr. Hitchcock ends his paper by saying : “The writer has no 
desire to disparage the value of Emmons’ observations.” This is 
a great change and a complete revolution of the opinions previ- 
ously expressed by him ; for, until now, he has opposed Dr. Em- 
mons’ observations in all his writings, and in all his geological 
maps. Even his last geological map of the United States, of 1887, 
prepared to illustrate the “nomenclature recommended by the In- 
ternational Geological Congress,” is hostile to the Taconic system, 
using in place the name Cambrian system, against the decision of 
the Berlin Congress of 1884, which has recommended the use of 
No. 1 only to designate the system containing the primordial fauna 
of Barrande and Emmons, until the meeting of the Congress in 
London, in September, 1888, shall decide about the name. 1 
1 The International Congress, at London, was unable to come to any decision; and 
at its meeting of September 18, it was decided that no vote should be taken, either 
on the division of the Lower Palaeozoic rocks into three or only two systems, or on the 
names to be used ; so it remains an open question, leaving every one at liberty to use 
t he nomenclature which he prefers. I shall add only that the general secretary of the 
committee of nomenclature, Prof. Dewalque, has accepted and recommended for adop- 
tion the report of the American committee, dividing these rocks into: Taconic (Pri. 
mordial), Cambrian (second fauna) and Silurian (third fauna). 
