This condition of affairs increases the occlusion (closing) of the bowels, but makes very easy indeed the entrance and propagation of micro-organisms in the sub-mucous coat of the intestine. The conditions are now ripe and rife for auto-infection. Which of the following microbes are the most active agents of progressive auto-infection: the streptococcus lanceolatus, the bacterium pyogenes, the bacillus subtilis, the staphylococci, the bacterium coli commune? They all play a part in the game, reducing the body in time to a charnel-house. Or are such substances as putrescein, cadaverin, skatol or indol--which are derived through chemical change in the putrescent mass--contributors to the spread of the poisonous taint throughout the system? Any single one or a group of the fifty or more bacterial poisons may be the responsible agents in the ensuing auto-infection. Chemical analysis of the gases resulting from decomposition reveals oxygen, nitrogen, hydrogen, carbonic acid, protocarbonated hydrogen and sulphureted hydrogen, ammonia, and sulphate of ammonia. Leucin, tyrosin, lithic acid, lithates, xanthin, cystin, keratin, sulphureted hydrogen, etc., are deposits in the urine and are signs of the derangement of the intestinal canal and liver. The external symptoms observed are the following: the tongue is large, pale, flabby and indented by the teeth at the edge of the anterior third, while its surface is white and the papillæ often enlarged; the appetite may be excellent, though there is great functional derangement of the liver with lithemia, so that the sufferer is tempted to eat what he knows from experience will disagree with him; a bitter coppery taste in the mouth, due to taurocholic acid--a common symptom of lithemia or of imperfect oxidation of albumen; emaciation, fatigue, depression, headache, buzzing in the ears and deafness, disturbance of sight, loss of memory, faintness and vertigo, very marked in some cases; sometimes tenderness and pain under the cartilages of the right ribs; the fretting of the sensitive surface of the bowels by imperfectly digested, semi-putrescent food, resulting sometimes in convulsions, coma, paralysis, or in fetid diarrhea of an acid character producing a burning sensation or pain of the anus when the discharges are being passed; rumbling and twisting sensations in the region of the navel occurring with flatulency, and occasionally colicky pains which at times are so severe as to simulate poisoning. In some people certain articles of food, without being either toxic or putrid, induce indigestion and the production of microbes in quantity amounting to one third of fecal dejections. Prof. Ch. Bouchard says: