47° BOTANICAL GAZETTE [DECEMBER 
Although, like the briefer work of Jorgensen on the same subject, this 
book deals particularly with the malting and brewing industries, it will find 
an important place in many laboratories, both as a complement to the text- 
books which treat the chemical side of fermentation and as a systematic 
reference book.— Mary HEFFERAN. 
Ferns. 
THIS ELEGANT VOLUME 3 is intended primarily for amateurs and con- 
sequently is as free as possible from technicalities. An analytical key based 
upon the stalks is a principal feature of the book. In this key, the number 
of vascular bundles appearing in a transverse section of the stalk is the most 
important character. The chief divisions are those in which the cross section 
shows one, two, three, four, five, and more than five bundles, respectively. 
Other stem characters, such as the grooves, ridges, and color are prominent. 
There is also a key based upon the fructification. All the ferns of the north- | 
eastern states are figured and described, there being more than three hundred 
photographs, all of which are original. The photographs of sori, most of 
which are taken at a magnification of 5.5 diameters, are exceptionally fine 
and will be valuable not only to the amateur who is learning to identify ferns, 
but also to the teacher, who will find them useful in demonstration. In 
photographing the sori, a camera with a bellows extension of twenty-four 
inches was used, and the focal length of the lens was reduced by slipping 
over it a cheap copying and enlarging lens, thus giving the desired magni- 
fication. 
While the book is addressed to amateurs and is written in popular style 
the author’s acquaintance with ferns in the field, together with the peculiar 
key and excellent illustrations, will make it useful to the experienced 
botanist.—C. J. CHAMBERLAIN. 
MINOR NOTICES. 
PART 17 of Engler’s Das Pflanzenreich, a volume of 326 pages, treats 
the Lythraceae by E. Koehne.* 
GREENS has revised his Forestry in Minnesota® and made it more appli- 
cable for general use. A very valuable part of the volume is a tabular 
classification of what is known of the sylvicultural habit and uses of the 
3 WATERS, CAMPBELL E., Ferns, a manual for the northeastern states, with 
ytical keys based on the stalks and on the fructification. 8vo. pp- ix->36? 
iieaeied New York: Henry Holt & Co. 1903. $3. 
*ENGLER, A., Das Pflanzenreich. Regni vegetabilis conspectus. Heft 17- 
Lythraceae: E. Koehne. 8vo. pp. 326. fgs. 59. Leipzig: Wilhelm Engelmann. 
6 
5GREEN, H. C., Principles of arg aa ies 12 mo. pp. xiii 334- #85 73~ 
New York: John Wiley & Sons. 1903. $I. 
® Bor, Gaz. 34: 455. 1902. 
