. Bird notes . PAkROT AND CAT, belonging to Mrs. FRANK Al are very great Chums—the cat, when quite a liltle kitten, wort/</ getinto the cage, and they played together like two kittens. The parrotis delighted when the cat conies into the cage, and they play togethereven now that the cat has grown so large. To face page clbc Srorv) of Bii^-Bcatb. By \V. Gko. Cresweix, , , (Continued from page iSy). y^ AViXG dealt with the part phayed in the pro-l-^ duction of septicseiiiia by the conditions under,-jL/ which the virulence of the bacillus is increased,and hav
. Bird notes . PAkROT AND CAT, belonging to Mrs. FRANK Al are very great Chums—the cat, when quite a liltle kitten, wort/</ getinto the cage, and they played together like two kittens. The parrotis delighted when the cat conies into the cage, and they play togethereven now that the cat has grown so large. To face page clbc Srorv) of Bii^-Bcatb. By \V. Gko. Cresweix, , , (Continued from page iSy). y^ AViXG dealt with the part phayed in the pro-l-^ duction of septicseiiiia by the conditions under,-jL/ which the virulence of the bacillus is increased,and having discovered that bacilli propagatedat a low temperature are not so powerful for harm asthose which have been developed at high temperatureswith egg yelk for a nidus, it now remains ior us toconsider those influences which are inherent in thebirds themselves and which are of so much importancein connection with the same process. I allude, ofcourse, to the varNing degrees of receptivity of thedisease on the one hand and to those of immunityagainst it on the other hand, which are found to existin different species and in different individuals. This is naturally a difficult subject on which todiscourse clearly to those who have never paid anyattention to biological problems. It is so wide in itsscope, and there are so many factors
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