Show pure water in cisterns it is a common opinion that stored must be aired iu order to maintain its iii rity iset anro h 1 cry fixed and unalterable substance natural waters free from decaying organic matter always oxygen in a alato of solution anil unless tins free oxygen is bcd up by organic matter not require renewal if water must be freely exposed to the air to keep pino then we should expect water from artesian wells coming from pi cat depths beneath tho soil would bo cry impure but in reality it is exceptionally tio nally pure reaches the carlli in a very thoroughly aerated condition formed by precipitation in small drops and falling thousands ot feet through the nir it is dilli cult to could be more thoroughly nirad if this rainwater is preserved free from contact organic mitter and in clean cisterns it will remain pure and wholesome even when shut out aiom air the leaves and fragments of organic matter carried into the cistern by alic rain and lilly alic mailers falling into tho open cistern leaves sticks insects toadie and reptiles may lender any cistern foul tho booro open alio cistern tho more liable to lucli contamination another objection to open cisterns is the fact aliat wrigglers lers often form in tho water aard the water becomes too foul to use to say nothing of the crop of mosquitoes needlessly raised this past will not breed in cisterns entirely cut oft from the air if rainwater rain water could bo filtered before entering tho cistern so as to exclude organic matter no need of airing alio would be felt A od lillar might be prepared out of 1 sound and ivator tiglia cask as follows clarc a and watertight partition in alc middle of alic cask anil reaching two birds of alio way to lie coltom rill uio of clean washed let alio llio rainwater enter lat ci ally ho as to break alic dorco of into unc side of alio cask llvy water allowing down through alio gravel on sido of tho cask and up tho gravel on alic oilier side and thence discharging into alio cistern all animal and all vegetable may bo excluded by such a lilter aul whether filtered or not a closed cistern stands a better cliance to keep clean llian one to alic air airing a cistern is usually a delusion and a dr 1 l C bait college |