94 BOARD OF AGRICULTURE. 



the liquids at about blood heat. This emulsion may be 

 mixed with twelve times its amount of water and applied 

 with a force pump, spray nozzle, or even with a strong gar- 

 den syringe. 



Kerosene is a safe insecticide only when it is properly 

 prepared, and it is claimed that all failures in its use have 

 resulted from carelessness in making the emulsion. Kero- 

 sene emulsion is undoubtedly the best remedy for plant lice 

 of all kinds, and also for the squash bug, provided it be so 

 applied as to fall on the under side of the bugs. It is also 

 valuable for the destruction of lice on our domestic animals, 

 and is an exceedingly useful substance with which to shower 

 an infested hennery. 



Finally, let me urge you to use all these insecticides, es- 

 pecially the poisonous ones, with great care, both with re- 

 gard to the danger to human life, and also the injury which 

 may be done to the plants by using an excessive quantity. 

 I would recommend that you experiment with them till you 

 personally understand just how to use them, and then I have 

 no doubt they will prove as useful for the destruction of the 

 insects described above, as paris green is on the Colorado 

 potato beetle. 



The Chairman. We have a little time now for the dis- 

 cussion of this most interesting subject, and if gentlemen 

 wish to ask the Professor questions, I have no doubt he will 

 be ready to answer them. 



Mr. Williams of Sunderland. The lecturer has not said 

 anything about the worm which causes the club-foot in 

 cabbages. I want to ask two questions : First, what is 

 the cause of club-foot in cabbages? and, second, how shall 

 we get rid of it ? I have lost my crop the past season in 

 consequence of it and I would like to know how to act 

 another year. 



Prof. Fernald. Did you see the worm? Are you sure 

 that a worm was the cause ? 



Mr. Williams. I argued from cause to effect. The 

 worms were there and there was no cabbage, and I argued 

 that the worms were the cause. 



Prof. Fernald. I have had no experience with the club- 



