| A test serum is positive if it forms a specific precipitin line with the antigen and forms a complete line of identity with the control serum. |
| Now all these specific reactions, the precipitin reaction as well as the anaphylactic reaction, can be called forth by proteins. |
| Their specificity could be related to particular defined groups on the antigen and evaluated quantitatively with precipitin reactions and hapten inhibition of precipitation. |
| Some precipitin tests and preliminary remarks on the systematic relationships of four South American families of frogs. |
| The precipitin reaction, however, has never been applied to actual problems in avian taxonomy prior to the present study. |
| In antibody test against H. capsulatum, the positive immunodiffusion reactions involve one or more specific precipitin bands. |
