124 KANSAS UNIVERSITY SCIENCE BULLETIN. 



long, and it had a capacity of 68 cubic feet. The sewage en- 

 tered the upper end through a tile which dipped under the 

 surface ; the effluent passed out over a two-foot weir at the op- 

 posite end. Just in front of the weir was a baffle board 

 which extended to a depth of a foot below the surface, that the 

 effluent be not drawn from the surface. After passing over the 

 weir the water fell into a division box provided with an over- 

 flow and a small gate for regulating the amount to be aerated. 



That part of the effluent used for aeration was led through 

 40 feet of 4-inch troughing to aeration boxes. These troughs 

 contained seven cross-weirs, over which the water passed in thin 

 sheets, thus coming in contact with air. After leaving the 

 trough the water passed through a series of boxes, one placed 

 above the other. These boxes were 1 foot 6 inches long, 8 

 inches wide, and 3 inches deep ; each was provided with a weir 

 1 foot long, so that the water on leaving the box passed over this 

 weir in a thin sheet, then dropped to the next box in single 

 drops. 



After leaving the aeration boxes the water was led by a short 

 trough into the second tank, of the dimensions 1 foot 9 inches 

 wide, 1 foot 6 inches deep, and 4 feet long, of the same con- 

 struction as the large tank, and with a capacity of lOi cubic 

 feet. Both tanks had board covers, to keep out the direct sun- 

 light. 



The plan of the system is shown in plate XXIX and the ele- 

 vation in plate XXX. 



The sewage used was that from the two closets, the two urinals 

 and the wash-room of Fowler Shops. The time of passage from 

 the shops to the first tank was less than two minutes ; so the 

 solid material had no chance to go into solution or disintegrate. 

 Owing to the solid matter having to pass directly into the tank, 

 no analysis could be made of the sewage before its entrance. 

 An automatic register was attached to the closets (see table I) , 

 and an account was kept of the amount of soap and sawdust 

 used in the wash-room ( see table II and plate XXXI ) . Owing 

 to lack of time, no record was obtained of the number of times 

 the urinals were used each day. 



Samples of the effluent were collected in three places — as the 

 water left the first septic tank, as it left the last aeration box, 

 and as it left the small tank — the samples from these places 



