5° BOTANICAL GAZETTE [JULY 
The volume contains an abundance of illustrations, including a large 
number of a of excellent quality, as well as four plates of 
colored figures very well executed and reproduced.—CHARLES DRECHSLER, 
ew York Botanic Contec 
Rocky Mountain flowers 
Since the appearance of its earlier edition in 1914, none of the less technical 
books have proved as useful in becoming acquainted with the vegetation of 
the Rocky Mountains as Clements’ Rocky Mountain flowers? This is due in 
large measure to the drawings, and more especially to the attractive colored 
plates that are reproductions of water color sketches by Mrs. CLEMENTS. 
The twenty-five colored plates, together with a very simple descriptive text, 
have also been issued in a smaller volume? for the use of travelers, or to be 
se ede as a souvenir of vacation days. 
the notable features of the larger volume are a chart exhibiting 
the seuclle relationship of plant families, a key to the families, and numerous 
present edition is on thinner paper, and being bound in flexible leather covers, 
is very convenient as a pocket companion on mountain climbs.—GeEo. D. 
FULLER. 
Weeds of farm land 
Miss BRENCHLEY‘ has published an interesting book on weeds of farm 
land. This discussion of farm weeds should be interesting to the practical 
man as affording an opportunity of comparison between the problems of the 
English and the American farmer. For the latter there may be practical 
hints and methods that may be applicable to his own fields. The ecologist 
will find more discussion of the fundamental problems of competition and 
succession than generally appears in weed manuals. The chapters on ‘‘ Vitality 
of weed seeds,” ‘‘Association with soils,” ‘‘Association with crops, 
‘Grass land weeds” touch upon the relationship of plants to their environ- 
ment and to one another, and seek for solutions of practical problems in the 
control of limiting factors. Other interesting chapters are those on “ Parasitic 
“Fos ses of weeds, 
35 for Polygonum aviculare, and 40 for Ranunculus acris. The illustrations 
suffer by comparison with those of similar American books. —Gro. D. FULLER. 
2 CLEMENTS, F. d CLEMENTS, EpitH S., Rocky Mountain flowers. 8vo. 
pp. 392. pls. 47. Field ‘edtisia New York: H. W. Wilson Co. 1920 
3 CLEMENTS, Epits S., sito of the mountain and plain. 8vo. pp. 79. pls. 25. 
- New York: H. W. Wilson Co: 
4 BRENCHLEY, WINIFRED fag ee : fads land. 12mo. viii+239. figs. 41. 
London: Longmans Green & Co. 1920. : 
