100 Anniversary Address to the 
The publication of the first volume of M. Barrande’s great 
work on the Silurian System of Bohemia is a leading event of 
the geological year just completed, and from its importance 
commands our first attention. The researches, the results of 
which are embodied in this elaborate and beautiful treatise, 
were commenced twenty years ago, but have been more espe- 
cially prosecuted during the last thirteen years. From time 
to time we have had more or less detailed notices of the fruits 
of M. Barrande’s assiduous labours, but could scarcely judge 
of their minuteness and importance until he commenced to 
send them forth in full. He now takes his place definitely 
in the foremost rank of geologists and paleontologists. He 
combines in a remarkable degree both qualifications,—no 
small advantage when the wide general views and the classi- 
fication of great formations, such as are dealt with by this 
eminent man, have to be fully considered and put forth with 
ample arguments. Division of labour is good for the accum- 
lation of sound and abundant materials, but experience has 
shewn in both geology and the other sciences, that the 
greatest advances are to be made by combinations of kinds of 
knowledge in those who deal with the greater problems. 
M. Barrande has done well, it seems to me, by pursuing as- 
siduously the double course he has chosen. The main body 
of the purely geological portion of his work he proposes to 
publish when the paleontological details, which constitute 
most of the evidence upon which his views are founded, have 
been laid before the geological world in all their complete- 
ness. The task he has before him in this respect is a laborious 
one; no less than the detailed description and critical in- 
vestigation of some 1200 species of fossils,—for such is the 
number that has rewarded his search in Bohemia. The 
natural history and principal part of his volume, a bulky work 
in itself, is devoted to the order of Trilobites. Itis prefaced, 
however, by a general outline of the geology of Bohemia, 
which first deserves our notice, both on account of the in- 
terest it must present to British geologists dealing with 
paleozoic strata, and also because of certain original and 
peculiar views put forth in it. 
The Silurian formation of the centre of Bohemia consti- 
