63 
This is, in effect, the same paper published in the Botan- 
ical Gazette, Vol. xi., pp. 253-256, and 289-293, and noted in the 
BULLETIN, xii., p. 21. 
Weed Statistics.—J. C. Arthur. (5th Ann. Rep. N. Y. Agric. 
Exp. Station, pp. 298-300.) 
A list of weeds growing on one-twentieth ofan acre is given, 
with their relative numbers in 1885 and 1886. 
Botanical Notes. 
We have received a circular from Henry Willey, of New Bed- 
ford, Mass., offering for sale his collection of Lichens and books. 
The various works and collections are specified and enumerated. 
The specimens are mostly mounted or in envelopes, and the New © 
Bedford species are heavily duplicated. The whole is valued at 
$2,000. 
Les Lichens Utiles, par Dr. Felix Henneguy. Octave Doin, 
Paris, 1883. Octavo, pp. 114; 25 woodcuts. 
. The author gives us much more than the title would warrant 
us in expecting. Nearly half the book is devoted to the struc- 
ture and biology of lichens. Then follow chapters on the chem- 
istry of lichens, the uses to which lichens have been put, and the 
classification of lichens. The book closes with a detailed descrip- 
tion of all species known to be of economic value. Many of the 
species are figured, and illustrations also appear in the structural 
part. 
The economic part is of necessity chiefly a record of past 
uses, for very few lichens have held their own against modern 
substitutes; thus, of those which have been used in medicine, only 
one ( Cetraria Islandica) is now officinal, and since the introduc- 
tion of the aniline dyes, the once highly important tinctorial 
lichens have almost entirely gone out of use. The production 
of alcohol from lichen-starch, carried on to a considerable extent 
in Northern Europe, is one of the most important modern uses 
that are mentioned. 
Not the least interesting portion of the book is the introduc- 
tory half, and the general reader will find gathered here much 
valuable information. It must be said, however, that the views 
