No. 4.] THE GYPSY MOTH. 277 



held in check and prevented from further spreading. It is also com- 

 paratively easy to reduce the numbei's found in any badly infested 

 locality. From the daily reports which are made by inspectors, records 

 are kept in the office of the numbers of each form of the moth that are 

 found in each infested place. During the spring and summer of 1891, 

 the eggs, caterpillars and pup£e were gathered by quarts in every badly 

 infested locality', and the number was thus estimated. Since that time 

 all egg clusters and other forms of the insect have been counted as they 

 were killed, and the records kept of these figures show the condition of each 

 infested locality to-day as compared Avith its condition when first found . 

 In the vicinity of Muller Brothers' Tamiery, in North Cambridge, some 

 thirty thousand egg clusters were burned in the spring of 1891. In the 

 spring of 1892 twenty-five egg clustei's were found in the same locality, 

 and during the fall inspection of that year only one was found there. At 

 H. W. Spurr's estate in Arlington, a small grove of trees was entirely 

 stripped of its leaves by the caterisillars in 1891, and baskets full of the 

 pupas were destroyed there. At that time one man gatliered and coimted 

 over eleven hundred pupoe in one hour, and the moths were so numerous 

 that no count of them or their egg clusters was attempted ; the gromid 

 was afterwards cleared by fire. In the spring of 1892 four hundred 

 and forty-nine egg clusters were found there, and in the fall inspection 

 only sixteen were discovered. Near jMcGowan's Tannery, in Medford, 

 several large oak trees were badly infested. They had been entirely 

 stripped of their leaves in 1890, and in 1891 the caterpillars crawled out 

 from between the walls of the tannery (where the moths had laid their 

 eggs the previous fall) and were destroyed by the pailful. In the spring of 

 1892 five hmidred and nine egg clusters were found there, and during 

 the autumn only three have been taken. On the south and west sides of 

 a hill on Humphrey Street, Swampscott, the caterpillars of the gypsy 

 moth destroyed nearly all vegetation in July and August, 1891, in sjiite 

 of all that was done to check them. Many of the trees were afterwards 

 cut and the ground was burned over. Much spraying was also done 

 with Paris green, yet in the spring of 1892 two thousand six hundred 

 and thirty-eight egg clusters were gathered there, and the larvae hatched 

 in swarms from eggs which were hidden under the rocks and buildings. 

 The ground and shrubbery was burned over again, and a hurried search 

 this fall has thus far revealed only one egg cluster. Many other instances 

 might be given where the work has been equally effective. It is tlius 

 shown that it is possible to so diminish the numbers in badly infested 

 localities that their condition will be essentially the same as that of 

 such colonies as have already been exterminated. 



