V O L U M E 2 7 , NO. 8, A U G U S T 1 9 5 5 mccessfullj- exeru(ed with test strips which contain only 5 t o 6 y of starting conipound in a spot 0.7 em. in diameter. T o conserve further the compound, t h e strip may be cut in half, thus halving the spot, and each half used is a different organic chemical reaction. ACKNOWLEDGMENT
T h e author a.ishes to express his appreciation t o Carmela Santomieri and AIadeline Goldstein for their valuable technical assistnncae. This study n-as made possible by a grant from the Jane Coffin Childs llemorial Fund for Medical Research. LITERATURE CITED (1) .kxelrod. L. 11.. J . A m . Chem. Soc.. 75, 4074 (1953). (2) Axelrod, L. I
