I do not have any detailed knowledge about this item. It is a glazed ceramic jar and is stamped with the information " Doulton and Co Limited LAMBETH". I understand it was made as a water filtration device for times before purified water was available. It would have been fitted with a tap and probably had a ceramic lid and would have used charcoal as the filtration medium. It came into my possesion when we were having a clear out at work where over the years several of these jars had been used for growing plants for experimental work or as dispensers for split bamboo canes. Most had been identified with a pitch painted number and had the handles broken or chipped.