1922] CURRENT LITERATURE 415 
The second flora characterizes the middle and upper Devonian, and is called 
by ARBER Archaeopieris flora, because this fern predominates. 
ther very interesting early types occurred in the upper Devonian, like 
Archaeosigillaria, Protolepidodendron, and numerous other earlier representa- 
tives of Sphenophyllum, Sphenopteris, and Pseudbornia. 
This fascinating and very instructive little volume, whose value is increased 
by an extensive bibliography on the subject, forms a suitable monument for 
ARBER, who has been removed from the world of science at too early an age.— 
A. C. Not 
North American slime-moulds 
In 1899 Macsripe’s The North American slime-moulds was published, 
which was the first comprehensive presentation of this interesting group for 
American botanists. A brief review of that work was published in this journal. 
A second edition has just appeared,‘ the first edition “having been exhausted 
long ago.” It corrects certain errata of the first edition, but chiefly it incorpo- 
rates the results of research during recent years. The painstaking work and 
clear statement which characterize MACBRIDE have resulted in a book of 
unusual quality. It is intended especially for American students, and therefore 
discusses chiefly American species, but it also includes brief descriptions of 
other forms, and refers to many extra-limital species now generally 
To many botanists it will probably give a new perspective of a group of organ- 
isms often dismissed with too little attention.—J. M. 
MINOR NOTICES 
Manual of woody plants.—TRELEASE’ has published a second, revised 
edition of his small pocket manual of the woody plants used for decorative 
purposes. The intention of the author “is to make it possible for any careful 
observer to learn the generic and usually the specific name of any hardy tree, 
shrub, or woody climber that he is likely to find cultivated in the United 
States.” The need of a new issue indicates that the manual has found a 
constituency. In the revised edition certain errors have been corrected, and 
the scope of the book has been enlarged by including a few additional types.— 
7 oe 
British forestry.—A handy little volume by Hanson® gives in a non- 
technical manner the general principles of forestry as practiced in the British 
Isles and adjacent parts of Europe. In addition to plain directions for nursery 
5 Bot. Gaz. 29:74. 1900. 
6 Macsripe, THomas H., The North American slime-moulds. A descriptive 
America, with notes on some extra-limital species. 8vo. pp. xviit+-2 a99- pls. 23. 1922. 
7 TRELEASE, Pilea Plant materials of decorative gardening: The woody 
plants. ere . pp. xliiit177. Urbana: Published by the author. 1921. $1.00. 
Bi seiko - oy , Forestry for woodmen. 12mo. pp. 238. pls. 13. figs. 15. 2d ed. 
Oxford. 19 
