37 



The average of these 5 clusters gives the following result : 



Dead eggs, . . . 20 = 7.52 per cent., or about 7.5 per cent. 



Eggs apparently alive, . . 246 =92.48 per cent., or about 92.5 per cent. 



Total, .... 266 eggs. 



Since this locality, in which the wilt has worked, contained only 

 246 eggs with apparently living embryos in average per cluster, nearly 

 2 clusters were necessary to equal a single normal cluster. The num- 

 ber of fresh clusters, which were estimated at about 150, must therefore 

 be reduced to about 90. The number of apparently living eggs of that 

 part of this locality which bears the oaks was therefore decreased to 

 about 22.5 per cent, after the wilt had worked, while, as already men- 

 tioned, the part with the birches contained probably no living eggs. 



Haverhill, Mass. 



Division Agent, H. F. ARMSTRONG; Local Superintendent, G. F. MOORE. 



With the assistance of the local superintendent a place was selected 

 for the experiment in East Parish, Haverhill; it is situated west of 

 East Broadway and northeast of Millway Pond, and on the Old Coun- 

 try Road. This locality represents almost 50 acres of isolated forest, 

 in which oaks about thirty years old, mixed with underbrush, prevail. 

 Only about 12 acres of this forest are infested with the gypsy moth. 

 The caterpillars were numerous here during the summer of 1909, but no 

 disease was present, according to the local superintendent. On May 

 18, 1910, our joint estimation gave 1,000 clusters per acre, i.e., alto- 

 gether about 12,000 clusters. No artificial means of destroying the 

 gypsy moth had been undertaken. 



Mr. Moore, owing to lack of time, could not raise caterpillars for 

 the experiment, and he had no reliable man to whom he could entrust 

 the work. Upon the recommendation of Mr. Fitzgerald, the field in- 

 spector of the northern divisions, the brother of the local superin- 

 tendent of Methuen, Mass., Mr. Wagland, was intrusted with the raising 

 of the caterpillars. As no communication was received from Mr. Walter 

 Wagland by June 21, 1910, that his caterpillars showed signs of 

 Flacherie, I went on this day to Methuen, to convince myself of the 

 condition of the insects. The local superintendent, A. H. Wagland, 

 Mr. Walter Wagland's brother, was with me, and we found that all 

 the caterpillars were sick and that several had already died. The reason 

 why I had received no word from Mr. Walter Wagland was that he 

 did not recognize the disease. The planting of the material in the se- 

 lected place in Haverhill was accomplished the next day. All the 

 material was exposed in a pasteboard box in the western part of the 

 forest, about 6 feet from the ground and between limbs of oak trees. 



