Tenth Annual Meeting loi 



Question: "You spoke of the mechanical condition of the 

 pump as being responsible for the damage in some cases. Was 

 that on account of the mechanism of the pump?" 



Professor Johnson: ''Oil and water are not of the same 

 specific gravity, and as soon as a man lets up on the handle of 

 the pump they tend to separate. If he is using a 25 per cent 

 solution, one-quarter is oil. Now if he lays on the handle 

 fifteen or twenty minutes that quarter of oil will be very apt to 

 come to the top, and the very first plunge he makes with the 

 pump handle he is going to throw almost pure oil. There are 

 pumps upon the market which are being satisfactorily worked. 

 They have done good work for us, and we are using them, 

 but, at the same time, they admit of great improvement yet." 



Question: "I would like to inquire if down in Maryland 

 you go right into a citizen's garden and look to see if they have 

 the scale?" 



Professor Johnson: 'T said that we had the right to do 

 that. In some instances, we have had to go in and pull up all 

 the currant and gooseberry bushes, and even the few little 

 shrubs that some people usually set out. We have been obliged 

 to do it." 



Mr. Hoyt: "What time of the year do you usually make 

 your investigations?" 



Professor Johnson: "Any time after the breeding season 

 opens. The breeding season is about from the ist to the 15th 

 of June, or from the middle of June say until it gets cold. I 

 have seen them breeding up to the igth of December as far 

 south as Washington, and further south you will find them 

 much later than that. It usually takes several severe frosts 

 , before they will stop breeding, and I should say up here in 

 this section you would be apt to find them from June to 

 November." 



Mr. Innis: "I found them in Bridgeport breeding as late 

 as the 25th of November this last year." 



Mr. Hoyt : "Any danger of carrying them in your clothes 

 from one place to another? " 



Professor Johnson: "Yes, sir. We have one case on 

 record where they were carried five miles on the harness of a 

 horse." 



