Қ-сы шыға m P uir тар 
[Vor. 1, 1914] 
356 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
treatment; with a fairly thick lime wash or lime wash and lamp- 
black also increases the transpiration rates, the latter more than 
the former. Lampblack added to Bordeaux seems also to give 
a higher rate than the Bordeaux alone. It is to be emphasized, 
however, that the strength of the lime wash employed is four 
times as great as the lime in the stronger Bordeaux mixture ; 
likewise, more lampblack is used with the lime wash than with 
the Bordeaux. It seems to be definitely established that cer- 
tain specific characters of the film are important, but these 
results suggest, further, that the additional quality of color is 
а factor requiring consideration. Тһе fact that injury may 
result from the accelerated transpiration induced by a heavy 
film of Bordeaux under the conditions of our experiment does 
not mean that under normal conditions of growth in the field a 
benefit may not accrue to certain plants—from factors asso- 
ciated with a high transpiration rate. 
Graduate Laboratory, Missouri Botanical Garden. 
EXPLANATION OF PLATE 
PLATE 18 
View of the apparatus (with tomato plant) by means of which watering 
was automatically controlled. It has been found convenient to have 
both stand and cup painted green. For description see text, p. 322. 
