To keep these tubes in place, a bandage wet with Dakin's solution is placed over them. The wound is flushed every two hours with Dakin's solution. The amount of solution used per wound, varies in proportion to the size of the wound from 500 c.c. per day up. Wounds are dressed daily. The bacteriological observation is made by taking a smear from the most vicious part of the wound at intervals of two or three days. The number of bacteria on these smears is noted and counted per oil immersion field. A count of more than 75 bacteria per field is considered infinity. When there are less than 10 bacilli to the field, and not less than 5 to the field, three fields are counted. When less than 5, and not less than 7, five fields are counted. When less than one, from five to twenty fields will be counted. A wound that retains a count of one bacillus to two fields or less for three observations, is considered bacteriologically clean, and suitable for operation. If the wound is a compound fracture, it is advisable to close the wound, converting it into a simple fracture. If this can be done without exerting too great tension on the sutures. If the wound is a flesh wound, and can be drawn together without too great tension, its closure is indicated. [Illustration] The important parts of the treatment consist in thorough irrigation, and careful bacteriological observation. The bacteriological observations are charted on charts similar to temperature charts. Dakin's Solution. (Sodium Hypochlorite at 0.50%) 1--To prepare 10 litres of solution, weight exactly: Chloride of Lime (Bleaching Powder) 200 grms. Carbonate of Soda (dried) 100 grms. or if used in crystals 200 grms. Bi-carbonate of Soda 200 grms. 2--Put the Chloride of Lime into a large mouthed bottle of about 12 litres capacity. Add 5 litres of water (half the quantity) and shake well two or three times. Let this stand all night. 3--Dissolve in another 5 litres of water of two Soda salts 4--Pour this latter solution directly into the bottle containing the maceration of lime. Stir well and let the solution stand in order to allow the precipitate of Carbonate of Lime to settle. 5--At the end of half an hour, siphon the clear liquid and filter by means of a paper, in order to have a perfectly clear solution. This should be kept away from the light. 6--No heat should be employed in the manufacture of Dakin's and ordinary Tapwater should be used. * * * Preparation of Dakin Solution. Technique of Dr. Daufresne. The solution of sodium hypochlorite for surgical use must be free of caustic alkali; it must only contain 0.45% to 0.50 of hypochlorite. Under 0.45% it is not active enough and above 0.50 it is irritant. With chloride of lime (bleaching powder) having 25% of active chlorine, the quantities of necessary substances to prepare ten litres of solution are the following:--