Plumber, of Pottsville, Pa , writes:

"Inclosed please find rough sketch of county grounds and buildings to show drainage system. The dotted lines show new connections, ink circles show perpendicular run of soil pipe to be put in new. All places marked ' inlets ' are not trapped, but those marked 'trap' are inlet traps. The size of drain is marked on same. The creek is open and very seldom gets as high as drain pipe. The drain is salt-glazed terra-cotta pipe.

" What I want to know is this: I have the contract to do new work, and the architect has specified running traps at the bottom of all lines of soil pipe with air vent and to continue the same to roof of buildings, each fixture to be trapped and ventilated.

" Now I claim that the best way would be to leave out the running traps and connect direct to drain; and that all foul air would at once escape above buildings and that the running traps only form a cushion whenever any of the fixtures are used, and forms foul air out of fresh-air supply. Am I not right? By answering the above you will confer a favor."

[As we understand the case from your description and sketch we concur in your opinion, that traps at foot of lines of vertical pipes are objectionable. The trap should preferably be on each drain where it leaves the building, with a suitable fresh-air inlet.]