J. E. M. Mellor 



09 



Method. 



A wooden enclosure was made 6' 6" x 7', three sides of which were 

 formed by a tray 4" wide (Fig. 1 LMQJ and Fig. 2 MKRP), having an 

 outer wall extending 1' above and 6" below ground. This tray was filled 

 with sawdust and protected from wet by a sloping roof (Fig. 2 MN). 

 The walls were sunk below the ground level to prevent the larvae from 

 migrating, and the sawdust was to persuade them to pupate within the 

 enclosure. The fourth side was closed by a hollow wall 3' 6" high, the 

 inner side of which was sunk 0" below the ground (Fig. 1 DLIJ). The 

 4" between the back and front boards (Fig. 1 GHDI) was filled with 



Ground 



Fig. 2 



?:';v■■•.v^'•^■"V;•v^;,^v.:•■.M•^:^f^.w7.••J■.*?■A■••\v•v^^ 



V 



'""■"r"" 



K Leye/ 



Fig. 1. 

 Dotted Area = Sawdust. 



sawdust to act as a non-conductor ; and the wall was pierced in a centre 

 hne by five |" holes at points 3", 6", 12", and 18" from a point 2' 6" 

 from the ground, which was to be the top of the heap. 



The manure was placed against this wall so that its upper surface 

 reached this point 2' 6" from the ground. Tin tubes, closed at one end, 

 were then inserted through these holes so that they projected 6-5" into 

 the heap. Temperatures were taken by inserting a centigrade ther- 

 mometer into each tube. The thermometer used could be read without 

 removing it from the tube; and w^as provided with a piece of rubber 

 tubing which fitted on to the open end of the tin tube into which it was 

 inserted, thus preventing warm air from escaping from the tube. When 



