78 Observations on the Habits of Certain Flies 



A little life was evident in all five tubs on the first three days; but, 

 whereas the control gave 81 M. domestica between October 10th and 

 November 1.3th, No. 2 (surface 1) gave 1418, No. 3 (surface 4) 130, 

 No. 4 (incrementally 1) 3, and No. 5 (incrementally 4) 2; whilst No. 6 

 (borax) gave 16. 



The difference between the files emerging from the control and from 

 tub 2 may have been due to uneven sampling of the manure. Neverthe- 

 less the figures 2 and 3 contrast sufficiently with those of 81, 1418 and 

 130 to justify the following suppositions: 



1. That the larvae are able to live between the great heat generated 

 below by the manure and the larvicide sprayed on the surface only. 

 (The temperature 1 in. below was 41° C. on the fifth day, i.e. when the 

 manure was 19 days old.) 



2. That the best method to apply Creosote Oil Mixture is "Incre- 

 mentally." 



3. That 1 gallon to the ton is sufiicient; but a previous trial indicated 

 that more is needed. 



As the first experiment seemed to show incremental spraying to be 

 more effective than surface treatment, it was decided to repeat the 

 experiment wdth variations in quantities of solution, and to make a 

 further trial of borax. 



On October 30th, 1916, horse manure procured from the same source 

 was thoroughly mixed to ensure even sampling, divided into six lots 

 each of 1 cwt. 1 qt. and exposed as before. On November 20th they 

 were treated as follows: 



1. (Control) pressed into tub. 



2. Sprayed incrementally with 430 c.c. Creosote Oil Mixture = 2 gallons to 1 ton anil 



pressed into tub. 



3. Sprayed incrementally with 872 c.c. Creosote Oil Mixture =4 gallons to 1 ton and 



pressed into tub. 



4. Sprayed inerenientally with 1744 c.c. Creosote Oil Mixture = 8 gallons to 1 ton and 



pressed into tub. 



5. Watered with can with 5 oz. Borax to 5 quarts water to 5 cu. ft manure. 



6. Watered with can with 5 oz. Borax to 5 (juarts water to 5 cu. ft manure, and later 



sprayed on the surface with 218 c.c. Creosote Oil Mixture, i.e. 1 gallon to 1 ton. 



The treatment of No. 6 with borax was an attempt to drive the 

 larvae up into the Creosote Oil Mixture. 



Holes were drilled through the tubs at points 3 in., in. and 12 in. 

 from the surface, and tin tubes as used in a previous experiment (p. 69) 

 were inserted to about Sin. Temperatures were taken daily; and an 

 average of the three holes calculated for each (nh. 



