1⁄2% carbolic acid solution.

Normal salt solution.

1 cc. Old Tuberculin.

2. Preparation of Apparatus:

Glass apparatus, syringe and needles boiled before use.

Some keep needles and syringe in 95% alcohol.

3. Making Solutions:

Tuberculin No. I: Tuberculin No. II:
Label one bottle Another
.1 cc. = 1 mg. T .1 cc. = .1 mg. T
No. I:Put 0.1 cc. T in bottle No. I
Add 9.9 cc. of 1⁄2% carbolic acid solution
No. II:Put 1 cc. of Tuberculin solution from No. I into bottle No. II
Add 9 cc. of 1⁄2% carbolic solution