The other phase of the subject of immunity is concerned with the ability of bodies them selves to destroy bacteria—bacteriolytic im munity. It is known that if the blood-serum of certain animals is injected into an animal of a different species, the red blood-cells of the injected animal are destroyed. This process has been termed hmmolysis, and is observed under other conditions, as in poisoning by drugs, such as acetanilide, sulphonal, etc. A similar action of blood-serum on certain bac teria can be brought about by artificial means, thus manufacturing a bacteriolytic serum for use in destroying given bacteria in the human body. The various terms that are used in elaborating this hypothesis may best be ex pressed in the form of a chart, since in medical literature so many synonyms have been in vogue. See table next page.
As Prudden writes, "there seems to be abundant ground for the belief that the pro tective agencies which are evoked in both nat ural and artificial immunization are simply those which the body makes use of in its normal metabolism, exaggerated and diverted to dif ferent ends, it is true, in the face of emergen cies, but giving evidence of the birth of no new physiological capacities.* The new methods
of research and the far-reaching conceptions which they have stimulated and fostered seem likely to mark a new era in physiological chem istry, and to link more closely than any other extension of knowledge in our time some of the most subtle and urgent problems of medi cine to the wider outlooks of general biology.* See PATHOLOGY.
Virgin' ; the 'Assumption of the Virgin' ; the 'Annunciation' ; the 'Resurrection of Jesus' ; 'San Michael overcoming the Devil,' and the 'Four Evangelists.' The 'Marriage of Saint Catherine,' the 'Virgin Surrounded by Saints,' and three Madonnas are all in the gallery of the Museum. The cathedral of Imola possesses a 'Virgin and Saint Paul' ; 'Saint Peter); 'Zechariah and Saint Isabel.' Other works are in Munich, Berlin, Petrograd and Rome.