1. Phagocytosis of pneumococci in vitro runs parallel with phagocytosis in vivo. 2. Virulence depends not only on resistance to phagocytosis, but also on the ability to grow in the body of the animal. 3. The biological reaction of the pigeon to pneumococcus infection does not differ from that of the mouse. 4. The "immunity" of the pigeon to pneumococcus infection is due to its normal high temperature.

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Pfeiffer1 described a "true influenza" bacillus and a "pseudo-influenza bacillus." He was unable to distinguish these organisms in direct smears of exudates, where they both appeared as small bacilli with rounded ends. Culturally they were identical. He based his distinction on the fact that smears from cultures of the true influenza bacillus showed small bacilli with few longer forms, while smears made from cultures of the