4 BULLETIN 108, U. S. DEPARTMENT OF AGRICULTURE. 
The figures in the table show a decreased growth due to the sali- 
cylic aldehyde. Ten parts per million reduced growth from 100 to 
60, or 40 per cent, 50 and 100 parts per million were also extremely 
harmful, and very little growth occurred in the 200 parts per million 
solution. 
EFFECT ON COWPEAS. 
An experiment with cowpeas, similar to that with corn seedlings, 
was made, using the same concentrations of salicylic, aldehyde and 
the same nutrient solution. The plants grew in the solutions from 
June 15 to June 28. One plant was used in each culture. 
The effect of the aldehyde on the cowpea plants was similar to 
that with wheat and corn. In Plate II, figure 2, are shown the 
plants as affected by the aldehyde. From this it is seen that amounts 
larger than 10 parts per million are extremely harmful to the cow- 
pea. 
In Table II is given the green weight of the cowpea plants taken 
at the end of the experiment, and their relative growth. 
Table II. — Effect of salicylic aldehyde on cowpeas in nutrient solutions. 
Xo. 
Treatment. 
Green 
weight. 
Relative 
growth. 
Nutrient solution 
Same + 10 parts per million salicylic aldehyde. . 
Same + 25 parts per million salicylic aldehyde.. 
Same + 50 parts per million salicylic aldehyde. . 
Same 4- 100 parts per million salicylic aldehyde. 
Same + 200 parts per million salicylic aldehyde. 
Gvams. 
1.35 
1.35 
.70 
.35 
.20 
.15 
100 
100 
51 
26 
15 
11 
The figures in the table show that salicylic aldehyde in amounts of 
10 parts per million did not affect the green weight. The green 
weight was the same in that culture as in the nutrient solution which 
did not contain aldehyde. The culture containing 25 parts per mil- 
lion of the aldehyde, however, produced a much smaller plant than 
the control. The growth was reduced from 100 to 51. Solutions 
containing 50, 100, and 200 parts per million produced very poor 
plants. The plants made very little growth and were almost dead 
when the experiment was discontinued. 
EFFECT ON CABBAGE. 
An experiment in nutrient solution was made to determine the 
effect of the salicylic aldehyde on young cabbage plants. The 
nutrient solution was the same as that used with corn and cowpeas. 
The salicylic aldehyde was used in quantities varying from 10 to 200 
parts per million. In each culture 10 young cabbage seedlings were 
grown. The plants were supported in the culture jar by means of a 
cork, similar to the manner in which the wheat seedlings were grown. 
The plants grew in the solution from May 25 to June 12, 1912. A 
