139 



cussion. A careful compilation of the operation costs and fixed 

 charges of horses and wagons, and various types of motor ve- 

 hicles, based on a mileage of thirty miles per day, gives the 

 following results : 



The advantage of cost of operation is decidedly with the 

 motorcycle, but the advantage of capacity is decidedly with the 

 truck. The motorcycle will carry forty gallons of oil and two 

 men ; a Ford truck, two hundred gallons of oil and three or four 

 men. The difference in cost between the operations of a motor- 

 cycle and a Ford truck would not be over $150' for a season of 

 4,000 miles. The more satisfactory service rendered by the 

 truck would more than compensate for the increased cost. In 

 this connection I cannot emphasize too strongly the need of 

 having adequate transportation facilities at the immediate dis- 

 posal of the man or men in charge of the oiling. There should 

 be no waiting in one locality for a vehicle to finish in another. 

 Such waiting makes efficient work impossible. 



There are some classes of breeding places that should be oiled 

 on a schedule, because it is cheaper to oil them than to inspect 

 and then oil the ones found breeding. Such places are sewer 

 catch-basins, cisterns, cesspools and abandoned wells. This 

 schedule should vary with the season as does the inspection 

 schedule. Most of the oiling, however, is of an emergency 

 nature, and must be undertaken when the breeding is reported. 

 In the spring, when the woodland pools and swamps breed, it 

 is a good plan to wait until the last moment before oiling in 

 order to give as many eggs as possible time to hatch. It is in- 

 teresting to note that each year a thorough oiling of spring 

 breeding is followed by lighter breeding in the succeeding spring. 

 This means that after several years of work one complete oiling 

 of woodland pools and holes will usually suffice for the entire 

 season. 



Horse and wagon, .... 

 One-ton service truck, . .( 

 Ford truck, .1. . , 



Motorcycle with side van, 



$6 00 

 2 79 

 , 2 13 

 93 



