Abstract
1. A specimen of Group A substance (contaminated with some Group O substance), obtained after alkaline scission at 20°C of pig stomach mucus, as well as the products from it after conditioned acid hydrolysis, did not precipitate with an antipneumococcus type XIV horse serum.
2. The horse serum lost the agglutinating potency toward various groups of erythrocytes to equal extents when absorbed with type XIV pneumococcus.
3. The hemagglutinin in the horse serum was absorbed by secretor and non-secretor salivas in similar grades.
4. The horse serum treated with erythrocytes of one blood group lost the potency of agglutinating various groups of erythrocytes in similar degrees.
We were led from the findings above and those of former investigators to the conclusion that the hemagglutinin in the type XIV antipneumococcal horse serum reacts with carbohydrate-containing factors other than the A, B and O group substances with a surface structure common to species human, rabbit and cat.
Through the Grant Committee for Scientific Researches was given a grant from the Education Department in aid to us. H. Masamune.
