The methods commonly employed in applying the Pirquet test involve either scarifying the skin with a blunt instrument or making a superficial scratch with a needle. Some clinicians apply the tuberculin after the abrasion has been made, and others perform the test through a drop of tuberculin placed on the skin. The tuberculin is usually permitted to dry in the areas on which it is placed. Both of the foregoing methods of performing the test prove satisfactory in detecting the presence or absence of previous tuberculous infection. In applying the Pirquet test to children attending the Lymanhurst School for Tuberculous Children, it was found that the children preferred to have the test applied by making a single puncture through the skin rather than by scarifying the area with a blunt instrument. Since, from the