EUROPEAN HERBARIA. 17 
lously preserved in its original state, by his worthy son and 
successor, Professor Adrien Jussieu, comprises many North 
American plants of the older collectors, of which several are 
authentic for species of Lamarck, Poiret, Cassini, ete. 
The herbarium of De Candolle at Geneva, accumulated 
throughout the long and active career of this justly celebrated 
botanist, and enriched by a great number of correspondents, 
is surpassed by few others in size, and by none in importance, 
In order that it may remain as authentic as possible for his 
published works, especially the ‘‘ Prodromus,” no subsequent 
accessions to families already published are admitted into the 
general herbarium, but these are arranged in a separate col- 
lection. The proper herbarium, therefore, accurately exhibits 
the materials employed in the preparation of the “ Prodro- 
mus,” at least so far as these were in Professor De Candolle’s 
own possession. As almost twenty years have elapsed since 
the commencement of this herculean undertaking, the authen- 
tic herbarium is of course much less rich in the earlier than 
in the later orders. The Composite, to which seven years of 
unremitted labor have been devoted, form themselves an her- 
barium of no inconsiderable size. It is unnecessary to enu- 
merate the contributors to this collection (which indeed would 
form an extended list), since the author, at least in later 
volumes of the “ Prodromus,” carefully indicates, as fully as 
the work permits, the sources whence his materials have been 
derived. The paper employed is of az: ordinary kind, some- 
what smaller than the English size, perhaps fifteen inches by 
ten; and the specimens are attached to half sheets by loops 
or slips of paper fastened by pins so that they may readily be 
detached, if necessary, for particular examination. Several 
specimens from different sources or localities, or exhibiting 
the different varieties of a species, are retained when practi- 
cable ; and each species has a separate cover, with a label 
affixed to the corner, containing the name and a reference 
to the volume and page of the “ Prodromus” where it is de- 
scribed. The limits of genera, sections, tribes, ete., are marked 
by interposed sheets, with the name written on projecting 
slips. The parcels which occupy each compartment of the 
