EXPERIMENT STATION REPORT. 59? 



A practical difficulty in securing dilution with water led to a 

 <rorrespondence in which it was learnt that it was proper to "add 

 the A\a,ter to the material instead of the material to the water. 

 'Our i>reparation is an oil emulsion, not a soap; neither is it 

 saponified in anv way." * * * "It should b© diluted with 

 water when ready to use, as all emulsions will separate after being 

 mixed with water for some time, although I have used it myself 

 after it had been mixed in spray pump for two or three days \vith 

 .good results.'' It was also learned that there was 95 per cent, of 

 oil in the enndsion, but that there might be a slight variation. 



The nuiterial had a very decided odor of kerosene when opened, 

 and it was noted that there was a covering of clear oil on the sur- 

 face, which comliined with the sediment on shaking and then made 

 a thick, liglit reddish-gray emulsion. To test its stability, 22 cc. 

 was poured into a test tube and allowed to stand twenty-four hours. 

 It had then separated into four layers, as follows : First, at bot- 

 tom, 2V2 cc. of a dirty reddish-cream color; second, a film of 

 whitish cream between layers first and third; third, the mass ot 

 materia] of a lighter reddish-gi*ay and creamy in consistency, and 

 fourth, a thin layer of oil. All these combined readily on shaking, 

 but separation began again as soon as quiet was restored. 



The 1 to 20 dilution was also tested, and to I2V2 cc. of Skidoo, 

 well shaken up, 2?j7Y2 cc. of water was added, making a total of 

 •250 cc. The material dissolved readily and formed an even milky 

 mixture with a slight scum on the surface. Within an hour there 

 was 2 cc. of clear oil on the surface, and after twenty-four hours 

 10 cc. of clear oil was on top — nearly all there was in the comln- 

 Tiation — and the 1>alance was a whitish watery mass. This could 

 not ho recombined, and after thorough shaking again the oil ri^se 

 to the surface. 



August ISth, applied the 3 to 20 mixture to a small, very scaly 

 apple tree. August 25th, there was little iujury to foliage, except 

 at the tips on two limbs, which the leaves were distinctly burned 

 aud brown. There were plenty of larvip and recent sets. 



September 29th, the same condrination was applied on a plum 

 and on a peach tree, Iwth pretty well infested by scale, l^ext day 

 the plum showed no signs of injury: there were jdenty of crawling 

 Tarv?p, and it was doul)tful whether more than the larvse actually 

 •crawling at tlie time of the applicatioii v'f>-"e 1^-iUed. On the pe;;cl7 

 tree the results were similar 



