76 THE NEW INSECTARY. 



by copious watering. He claims that the grubs disappear. 

 AppHcation should be made immediately upon the appear- 

 ance of the pest. 



Some experiments tried by the entomologist in 1902. 

 show interesting results. 



Grass drenched with kerosene emulsion (i part emulsion 

 to 6 parts water); grass injured and grubs not killed; 

 one part emulsion to ten of water, same results; tobacco 

 water (y^ lb. stems steeped in i gal. water), no effect what- 

 ever; bisulphide of carbon, i oz. in shallow pan placed under 

 tight box inverted over dead patch of grass (capacity of box 

 3,458 cubic inches), killed all grubs in three hours without 

 in the slightest way injuring the green grass with which it 

 came in contact. This is in round numbers, i part of liquid 

 to 1,900 parts of atmosphere. Bring no light of any kind 

 near bisulphide of carbon. We illustrate one of the lantern 

 traps referred to above in Fig. 60. The tub contains a few 

 inches of water covered with kerosene. 



THE NEW INSECTARY. 



The accompanying photograph illustrates the exterior of 

 our new insectary, just completed, at a cost of $2,500.00, that 

 sum being appropriated for the purpose by the last legislature. 

 The plans were made, following suggestions of the entomol- 

 ogist, and the construction superintended by Messrs, Boss & 

 Bull of the Mechanical Division of the institution, to whom the 

 writer's thanks are due for many courtesies, and much pain- 

 staking effort. 



Here, we can study the life history of any insect, under the 

 most favorable conditions, and at almost any time of the year, 

 anticipating the summer season, and profiting by being thus 

 enabled to work before the arrival of the busy season, when 

 more demands are made upon the time of an entomologist for 

 outside work. Further, by having any special groups of 

 insects thus under control, and in a condition where very close 

 and accurate observations may be made, one has a great 

 advantage, for it is very difficult and some times impossible 

 to make these observations in detail in the field. The need 

 of such a building has long been felt here, and we are to be 

 congratulated upon finally realizing our ambitions in this direc- 



