No. 4.] THE SAN JOSE SCALE. 393 



properly mix in water without breaking up into yellowish 

 flakes. Experiments thus far made with applications during 

 the summer have failed to give a substance that will destroy 

 all of the insects. As good results have been obtained from 

 the use of ordinary kerosene emulsion as from any other 

 substance. It was found advisable, however, to repeat the 

 spraying at intervals of about a week, as the young are 

 brought forth in succession during the season. Kerosene 

 emulsion is composed of kerosene oil, two gallons ; common 

 soap, one-half pound; water, one gallon. Cut up the soap 

 and boil it in the water till it is all dissolved, then add it, 

 boiling hot, to the oil, and churn it briskly for five minutes 

 or more with a spraying or force pump. When required for 

 use mix thoroughly one part of the above emulsion with nine 

 parts of water and spray the trees with it. In spraying 

 peach trees, however, it is recommended, because of their 

 liability to injury, to mix one part of the emulsion with 

 fifteen parts of water. The emulsion will dissolve more 

 readily if hot water be used. 



Legislation. 

 It is strongly recommended by some entomologists to have 

 laws passed requiring nurserymen and other dealers to guar- 

 antee their stock free from the San Jose scale ; but I am free 

 to confess that I feel very doubtful about this matter. It 

 seems to me that the fear of loss of trade will be a greater 

 incentive to send out only uninfested stock than the fear of 

 any amount of legislation. 



