Cposr reaotion$ of anti-tmhoid and anti-Paratsnho$d B sexq The selective greoipitation of one or mobher of' there sera by the ct~p~ul~r polyaaachprlde of Type XI pneum6ooaour, yeast fmman# ~1 0g0n8 gum arebio, and carob muoilage in particular, harr permit P ed deduotiona a8 eo the linkah:s8 of galaetoro, ~IUUOS~, and aanno1e in the typhoid O-polyraoaharld8 and eertiain diffarenoer in the lfnkagee of ma~orro In the para B polyorocharide..Dre A. PI.