1908.] PUBLIC DOCUMENT- -No. 73. 201 



The visit to the laboratory at North Saugus has benefited and edified 

 us., The truly ingenious methods which are applied there are adapted 

 perfectly to the end which you propose, and we have been able to see 

 that the acclimatization of the insects in question can be considered 

 now as an accomplished fact, at least for a good part of the species 

 upon which the experiment has been made. Such results obtained in 

 so short a time permit us to think that the acclimatization of the other 

 species will also be accomplished. The warfare against the injurious 

 insects will thereafter be undertaken under the same conditions as in 

 Europe, and we have a certain belief that it will be as efficacious. 



One point which has particularly struck us is the minute precautions 

 which are taken in the laboratory at North Saugus to avoid the intro- 

 duction into America of insects other than those which it is necessary 

 to introduce. The methods of rearing and of selection which you have 

 chosen, and which Mr. Kirkland and his assistants carry on in such a 

 conscientious way, give every surety against the legitimate apprehen- 

 sions of those who may fear the introduction of species not useful hi 

 the struggle undertaken, but, on the other hand, injurious to certain 

 American crops. 



We have thought, dear and honored colleague, that you should 

 authorize us to express to you all the satisfaction which our visit to-day 

 to the laboratory at North Saugus has given us, and all our admiration 

 for the conscientious intelligence and persevering energy which you 

 have shown in this novel work. The States of the Union owe you much 

 already; you are rendering them an actual and new service of truly 

 inestimable value. 



Please believe, dear and honored colleague, in our most affectionately 

 devoted sentiments. 



REPORT OF PROF. WALTER W. FROGGATT, 



GOVERNMENT ENTOMOLOGIST OF NEW SOUTH WALES AND INVESTIGATOR FOR 

 VICTORIA, SOUTH AUSTRALIA AND QUEENSLAND. 



WASHINGTON, D. C., Oct. 14, 1907. 



Dr. L. O. HOWARD, Bureau of Entomology, United States Department of 



Agriculture, Washington, D. C. 



DEAR DR. HOWARD : - - 1 have been very much interested in my visit 

 last week to the districts infested with the brown-tail and gypsy moths. 

 The area they have spread through is so vast that I do not think that 

 with mere mechanical methods, such as spraying, burning, etc. (and 

 even they must be continuous), they will ever be more than kept in 

 check. Therefore, the question of introducing into these infested dis- 

 tricts all the parasites that can be found attacking these destructive 

 moths in their original home appears to be a very rational one. With 

 an unlimited food supply around them, and no danger of liberating the 

 secondary parasites that probably destroy a very large percentage in 



