84 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 7 



Chief of the Bureau. An office is maintained at 43 Tremont Street, 

 Boston, Mass., which furnishes headquarters for the men under whose 

 direction the different lines of work are conducted. A laboratory is 

 maintained at Melrose Highlands, Mass., which serves as headcjuarters 

 for receiving and disseminating collections of parasites and natural 

 enemies of these insects and for conducting investigations and experi- 

 ments, the results of which form a basis for work in the field. The 

 entire work is being undertaken along the following lines : 



1. Experimental Work. 



2. Silvicultural Investigations. 



3. Quarantine Work. 



4. Scouting Work. 



Experimental Work 



This work is being carried out under the supervision of the writer 

 and at the present time several distinct projects are being investigated 

 as follows: 



(a) Parasite Work. 



(b) Field Observation Work. 



(c) Food Plant Work. 



(d) Dispersion Work. 



(e) Disease Work. 



(f) Secondary Insect Work. 



Parasite Work.- — This work is in charge of Mr. J. N. Summers, 

 and has for its object the introduction, breeding, and dispersion of 

 the foreign parasites and predaceous enemies of these insects. It is 

 necessary to make a critical study of the life history and habits of these 

 beneficial species in order that they may be utilized to the best advan- 

 tage. Much progress has already been made in this direction and 

 several species have already become firmly established in this country, 

 and are doing good work in reducing the increase of the pests concerned. 

 A careful investigation is made each year to determine the increase 

 and spread of the beneficial species and a great amount of valuable 

 scientific data is being secured. 



Field Observation Work.^ — This is being supervised by Mr. C. W. 

 Minott, and has for its object a determination of the natural increase 

 of the gipsy moth under field conditions. Observation points have 

 been selected, aggregating more than 200 in number, scattered through- 

 out the infested region, and care has been taken to secure localities 

 where there are different types of forest growth, different degrees of 

 infestation, and where parasites have been introduced and where they 

 do not exist. A careful study is made during the summer and fall, 

 and accurate records are kept of the increase or decrease of the species 

 in these areas. Also a determination is made of the effect of defolia- 



