548 A CONTRIBUTION TO THE STUDY OF THE PRECIPITINS, 



48 hours the reactions recorded in Table xv. were complete and 

 the precipitates were read. The superfluids of tubes 1 were 

 removed and to the superfluids certain addiments of solutions of 

 egg-white were made. The solutions were those used in the 

 primary experiments. The observations are recorded in Table 



xvii. 



Table xvii. 



In the interpretation of these results, those recorded in Table 

 xvi., must be considered. The presence or absence of a precipi- 

 tate shows that in tube 1 the additional ostrich egg-white failed 

 to produce a precipitate, as the general avian precipitin was 

 already completely neutralised; in tube 2 there was no precipi- 

 tate for the same reason; in tube 3 the additional egg-white of 

 the partridge neutralised and precipitated the remaining preci- 

 pitin; in tube 4 the fowl egg-white neutralised the specific preci- 

 pitin for the fowl egg-white, yielding therefore a large precipitate; 

 in tube 5 the partridge egg-white failed to reveal any general 

 avian precipitin remaining present; and in tube 6 the duck egg- 

 white neutralised and precipitated the I'emaining general avian 

 precipitin. These results have also an interest in the light of 

 the similar properties of certain hsemolytic sera. The ambo- 

 ceptors present in these latter, combine with the corpuscles from 

 one species of animal, but after the corpuscles of this species 

 have extracted all the amboceptors capable of union with the 

 corpuscles, the corpuscles of a second species will unite with 

 other amboceptors present in the hsemolytic sera. 



