Barrande and the Ta conic System — Marcou. 125 
deposit" of calcareous and argillaceous mud; a leap in the 
mud. He gives a geological section across the Taconic 
area with fifteen faults; a leap among faults. Mr. 
Walcott "rules out the name Taconic from geological 
nomenclature;" he shows that "the name is not applica- 
ble" being "based on errors and misconception originally^ 
and used in an erroneous manner since;" and he proves 
that "Barrande was misled into crediting Emmons with 
a discovery that was based on errors of field observations.' ' 
He "invalidates the claim of priority of the discovery of 
the Primordial fauna" put forward by Barrande. He 
regards Emmons' primordial fossils as a "fortunate hap- 
pening," and "not a scientific induction based on accurate 
observation and comparison." And finally Mr. Walcott 
makes a declaration of his "principles," which he pro- 
claims are "the result of accuracy of his original obser- 
vations" made "hammer in hand ;" and having all the 
time "in mind," (1) "priority of definition," (2) "scien- 
tific induction," (3) "accuracy of original investigations," 
and (4) "the light of later results of his field work;" an 
array of imposing and weighty sentences never brought 
up before in American geology; and anything but credi- 
table to its author. 
XI. 1888. — Re-statement of the transfer of a part of the Pri- 
mordial fauna above the second fauna, by Mr. Walcott 
who thinks that "Dr. Emmons had not a clear idea of 
the position of the shales of the Hudson river valley that 
contain the graptolites described by Prof. Hall, nor of 
the shales of Pointe L6vis carrying the graptolitic fauna;" 
and consequently Mr. Walcott transfers the second and 
third zones of graptolites to the Utica slates or upper 
part of the second fauna;— a leap among the grap- 
tolites. 
XII. 1888. — Mr. J. D. Dana discovers the "confusions intro- 
duced by Barrande;" which have been "a hindrance to 
progress here and abroad." He advocates the total sup- 
pression of the Taconic system, referring all the Taconic 
rocks of Dr. Emmons to the Champlain division, as 
Mather did as far back as 1842, burying Avith great 
solemnity and honors the "Taconic ideas." 
