The successful disposition of sewage is the question of all-absorbing interest in nearly every large city in the world. Nowhere, perhaps, has there been a greater need, nor has the subject received elsewhere more able and critical study than in the city of London. Up to the date of the last month the royal commission on metropolitan sewage discharge have been unable to report any feasible plan for the purification of sewage by precipitation.
A Mr. Wollheim, of London, now claims to have discovered a method by which this result may be successfully accomplished. He utilizes certain organic bases belonging to the group of ammonia compounds in combination with lime. As the result of chemical reactions, a gaseous reagent is evolved to which he gives the name of " amminol." It is a powerful disinfectant and, as stated in the London Times, when introduced into sewage rapidly extirpates all microörganisms capable