32 LOSS THROUGH INSECTS THAT CARRY DISEASE. 



of fermenting vegetable refuse, accumulations of manure at the 

 sv'harves, and in bedding in poultry pens. 



Still more recent investigations were carried on during 1908 by 

 Prof. S. A. Forbes, State entomologist of Illinois, who has reared it 

 in large numbers from the contents of paunches of slaughtered cattle, 

 from refuse hog hairs, from tallow vats, from carcasses of various 

 animals, miscellaneous garbage, and so on. 



All this means that if we allow the accumulation of filth we will 

 have house flies, and if we do not allow it to accumulate we will liaA^e 

 no house flies. With the careful collection of garbage in cans and 

 the removal of the contents at more frequent intervals than 10 days, 

 and with the proper regulation of abattoirs, and more particularly 

 with the proper regulation of stables in which horses are kept, the 

 typhoid fly will become a rare species. It will not be necessary to 

 treat horse manure with chlorid of lime or with kerosene or with a 

 solution of Paris green or arsenate of lead, if stable men are required 

 to place the manure daily in a properly covered receptacle and if it 

 is carried aAvay once a week. 



The orders of the health department of the District of Columbia, 

 published May 3, 1006, if carried out will be very effective. These 

 orders may be briefly condensed as follows: 



All stalls in which animals are kept shall have the surface of the 

 ground covered with a water-tight floor. Ever}^ person occupying 

 a building where domestic animals are kept shall maintain, in con- 

 nection therewith, a bin or pit for the reception of manure, and pend- 

 ing the removal fi'om the premises of the manure from the animal 

 or animals shall place such manure in said bin or pit. This bin shall 

 be so constructed as to exclude rain water, and shall in all other re- 

 spects be water-tight, except as it may be connected with the public 

 sewer. It shall be provided with a suitable cover and constructed 

 so as to prevent the ingress and egress of flies. No person owning 

 a stable shall keep any manure or permit any manure to be kept in 

 or upon any portion of the premises other than the bin or pit de- 

 scribed, nor shall he allow any such bin or pit to be overfilled or 

 needlessly uncovered. Horse manure may be kept tightly ranuned 

 into well-covered barrels for the purpose of removal in such barrels. 

 Every person keeping manure in any of the more densely populated 

 parts of the District shall cause all such manure to be removed from 

 the premises at least twice every week between June 1 and October 31, 

 and at least once every week between November 1 and May 31 of 

 the following j^ear. No person shall remove or transport any manure 

 over any public highway in any of the more densely populated parts 

 of the District except in a tight vehicle, which, if not inclosed, must 

 be effectually covered with canvas, so as to prevent the manure from 

 being dropped. No person shall deposit manure removed from the 



