I. Rigid Rubber Drains. (Dr. Javars.)

3224

1. Select the red variety.

2. Place for five minutes in concentrated sulphuric acid.

3. Wash in 75 per cent, alcohol.

4. Keep in solution A IX.

Uses: In empyema, or wherever glass drains might be used.

II. Aseptic Rubber Drains.

3225

1. Select the red rubber.

2. Sterilize in the Arnold sterilizer, or by boiling in ordinary kettle one-half hour.

3. Keep in solution A VIII.

Uses: For ordinary drainage purposes. N. B. - If softer tubes are wanted, keep in solution carbolic, A II.

III. Glass Drains.

3226

Sterilize by boiling, and keep in solution A I, (2), or A II

IV. Bone drains.

3227

1. Prepare tubes by boring and trimming into cylindrical form, or select smooth chicken bones.

2. Clean well after boiling.

3. Decalcify in 10 per cent solution Hcl.

4. Keep in solution A IX. without any water. Uses: When drainage for only a few hours will be required, as these tubes collapse easily in serum.

V. Capillary Drains.

3228

1. Horse hair should be cleaned first with soap and water, and afterwards boiled for half hour and kept in solution A I. (2).

2. Catgut (see D I.)

3. Silk (see D II.)

4. Gauze strips (see E I. and II.)

5. Schede's twisted glass threads (see glass tubes).