[Vor. 5 
154 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
eonfirmation of the previous work, at the same time extend- 
ing the findings of Duggar and Cooley regarding the accel- 
erating effect of Bordeaux mixture and other surface films 
on the rate of transpiration of abscised leaves and potted 
plants. This work of Martin, conducted at the New Jersey 
Experiment Station, has been followed by a paper from Shive 
and Martin! on the effect of similar films upon the transpir- 
ing power of leaves, employing the method of standardized 
cobalt chloride paper as perfected through the work of Liv- 
ingston and Shreve.? The method referred to has proved 
applicable to the investigation of problems of this nature, and 
affords further decisive evidence of the increased transpiring 
power of leaves sprayed with Bordeaux. Lutman,’ in his 
careful study of Bordeaux mixture, has considered transpira- 
tion only in a subsidiary manner. He reviews the earlier 
work of the German observers, which, however, is based on 
rather inadequate experimentation, and seemed rather in- 
clined to assume that inereased transpiration might not be ex- 
pected; yet his own experiments, so far as they go, indicate 
in general an increase in transpiration due to the Bordeaux 
film. 
Метноов. 
In undertaking Ше present study it was decided to con- 
struct a rotating table, for the reasons given above, espe- 
cially in an effort to eliminate the often rather serious error 
in transpiration studies, due to differences of exposure of the 
individual plants involved in the experiment. А rotating 
table was aecordingly devised similar in principle to Livings- 
ton's* table for standardizing porous cup atmometers; in ad- 
dition, pan to the revolution of the several plants about 
1 Shive, J. W., and Martin, W. H. The effect of surface films of Bordeaux 
mixture о on Lue foliar transpiring power in tomato plants. Plant World 20: 67- 
86. Hs 17. 
ingston, B. d Shreve, E. B. Improvements in the method for de- 
termining the tanspiring power of plant surfaces by hygrometric paper. Ibid. 
19 : dian . 1916 
Lutman, B. ome studies on Bordeaux mixture. Vt, Agr. Exp. Sta., 
Bul. 196: 1-80. К em -4. ў: re 11. 1916. 
* Livingston, B. E. rotating table m ааа с porous сир atmom- 
eters, Plant World 15: B f. 1-2. 19 
