182 LETTERS TO PROFESSOR RILEY [CHAP. xvm. 



is a recipe for a mixture of soft soap with " paraffin or any 

 other mineral oil." It has been thoroughly tried over here, 

 and found very useful. If you should think fit to experi- 

 ment with it I should greatly like to know results. 



A single report of appearance of Hessian fly (fig. 15) here 

 has been sent me on June 13 with specimens accompany- 

 ing full grown but still in larval condition. These were 

 on lower shoots of wheat of which the plant was then 

 coming into ear at Revell's Hall near Hertford the farm 

 on which Hessian fly was first observed here. 



September 23, 1889. 



It was very kind of you to spare time to write to me 

 before leaving England, and I well know how very much 

 occupied you must have been, so must not be selfish 

 enough to say how much I regretted not being able to have 

 both the pleasure and the great benefit of a little conversation 

 with you. 



I beg to place in your hands the little brochure which 

 I am now issuing on one of the consequences of warble 

 presence, and might I ask Mr. L. O. Howard's acceptance of 

 the other copy ? You will see I have tried to condense the 

 points of the subject into a space that workers would not be 

 frightened at. It would be a great satisfaction to me if the in- 

 quiry met with your approval, and if you should judge fit to 

 forward the cause of prevention in your country, your high 

 authority would be a great help in strengthening my hands 

 here. If you care to have a packet of the leaflets for distri- 

 bution it would be only a pleasure to me to send some for 

 your acceptance. 



I have just seen with great pleasure that the Association 

 of Economic Entomologists has been formed, and that they 

 have elected the highest representative of the important 

 work as their First President. This is a great satisfaction to 

 me, and I hope ere long I may have the honour of being 

 enrolled amongst its members. 



You pay me a compliment in saying you would care 

 to have an occasional contribution of mine in your 

 valuable " Insect Life." If I had anything that I thought 

 would be of sufficient interest to send, I would very gladly 

 do so. 



[Here a contribution on the " Shotborer Beetle" (Appen- 

 dix D) followed, which was published by Professor Riley. 

 See also page 199.] 



April 10, 1890. 



I must take up a little of your valuable time in offering 



