2 BULLETIN XO. 200, U. S. DEPARTMENT OF AGRICULTURE. 



what isolated by its positioni on a hill and separated a considerable 

 distance from any near-by stables. On the accompanying map 

 (fig, 1), which has been adapted from a map of the Geological Survey, 

 is shown the topograph}^ of the surrounding section. The location of 

 only two of the college buildings is given, viz, the college kitchen 

 (K) and the stable (S). The college kitchen, by reason of odors from 

 cooking and the presence of large quantities of garbage kept in iron 

 pails just outside the door, attracted extremely large numbers of 

 flies. One could not approach these garbage pails without stirring 

 up a noisy swarm which had congregated there. However, no flies 

 were breeding out from this garbage, for the reason that it was 



Fig. 1. — Map of vicinity of the Maryland Agricultural College showing the location of the college kitchen 

 (£■), the stable (5), and the proximity of other breeding places of flies (,A,B, C, D, etc.) (Original.) 



entirely removed every two or three days and taken to a near-by 

 farm, where it was fed to hogs. 



The breeding ground nearest to the kitchen was the pile of manure 

 heaped just outside the college stable. This is nearly 200 yards 

 northwest of the kitchen. It is probable that a large majority of 

 the flies at the kitchen came from this source. Upon exammation at 

 various times during June and July the fresher portions of this heap 

 were always found heavily infested with larvae. Puparia were also 

 found in great abundance in the loose soil and in the manure at the 

 periphery of the pile. Three horses were kept m this stable, and 

 two of them were standing in the stalls during the greater part of 

 each day. FUes were also very numerous in and about the stable, 

 and during the day the horses were continuously tormented by them. 



