322 The Botanical Gazette. 
about Denver. It is meant to be something more than a list, fort 
contains more or less of popular description, but in the absence & 
analytical keys it can hardly aid the beginner in discovering thenama — 
of plants. It can be used as a useful check-list by the local botanist, 
and gives more or less information to the general botanist concerning 
the Denver flora. 
Dr. ALFRED C. Stokes has prepared a set of analytical keys! 
the “fresh-water algee and Desmidiez of the United States.” In 
introduction he makes a strong plea for “analytical keys,” claiming 
the ability to readily discover the name of an object will often 
tract the beginner to further study. These keys, founded upon 
Francis Wolle’s works, will probably enable amateurs to discover! 
names of the fresh-water alge readily enough. There is no questie® 
that such handy keys of groups stimulate their study. — 
A HEAVY PAMPHLET from the division of vegetable pathology of tit 
U. S. Department of Agriculture forms bulletin no. 4, and is‘ bale 
tin gives the experiments and conclusions of four years’ workin! 
the value of commercial and other fertilizers for the prevention # 
cure of yellows. In some parts of the country this method has 
much relied upon, having been supported by very good ss 
authority. The extended and careful labors of Dr. Smith, now 
show it to be worthless. The experiments upon which thiscone™ 
is based have been very thorough and form an admirable continuatie® 
Dr. L. M. UnpErwoop has published in the Memoirs 
rey Botanical Club an index of the literature 0 
purpose of this index is “to presentan author cata oy ie ae 
tions relating to this group, supplemented by a mut? : 
purpose of more ready reference.” It is to be complet 
of all species described, with reference 
nized at the present time, and a classifie 
is needless to say that the work will be exceed 
students of the Hepatice. The present part formst ie 
pages of the fourth volume of the Memoirs. ‘ory of the 4 
THE REPORT of the Division of Vegetable - A oF iowap 
Dep’t of Agriculture for 1892, by the chief, Mr. B. 4+¥* 
and $f 
1StoKes, Dr. ALFRED C. :—Analytical Keys oe 
fresh water alge and the Desmidiez of oe peso pyre 
Edward F. Bigelow, Publisher. Portland, ComB. — . 
