AUTUMN NUMBER ol 
injected into the stems. In two each was injected magnesium 
sulphate, sodium chloride and citric acid, in one distilled water 
and in one nothing. On each of these plants were placed twelve 
immature specimens of Myzus persicae about one week old. The 
plants were watered and kept in a healthy condition, and the 
aphids were allowed to mature there. The results show a few 
winged ones for each of the solutions, but not conclusive in favor 
of the chemicals. On one plant of each group all matured ap- 
terous. 
The same experiment was later tried by injecting some of 
each of these chemicals into young orange tips and tying up in 
each twelve immature Myzus persicae. Chemicals in same order 
as above. Here, also some winged ones were produced in each 
case, but most in the checks. 
Trials with Rose Aphids. A species of green rose aphid, 
probably Macrosiphum davisi, had been watched for over a year 
on rose bushes and no winged specimens were ever seen. There- 
fore an attempt was made to produce wings on some of them. 
Three cuttings of rose were made and placed in sand and wat- 
ered: No. 1 with 1% magnesium sulphate, No. 2 with 5% mag- 
nesium sulphate, and No. 3 with water. On each cutting was 
placed several of the rose aphids. The rose cuttings however only 
remained fresh for a few days, when they wilted and the leaves 
fell. The aphids died and no wings were produced. The experi- 
ment was repeated a little later, this time by changing the cut- 
tings about every three days and transferring the aphids to the 
fresh cuttings. In this way three generations were raised and 
about thirty individuals in each. All were apterous. No winged 
forms were produced not even in the second and third genera- 
tions. 
Effect of Chemicals on Plants. In all cases where cut stems 
were placed in chemical solutions it was observed that the checks 
in distilled water would last longer. A number of tests with cut- 
tings used in solutions of varying strength of the above chemi- 
cals showed this always to be the case. The chemical solutions 
caused wilting the second day and dropping of the leaves in two 
or three days. The checks stayed fresh for five days. In all 
these cases the results were conclusive enough to show that the 
chemical solutions do have a deleterious effect'on the cut plants, 
and plant physiologists agree on this point. Where the solution 
is strong enough it will have an osmotic pressure, which will 
