1. Influence of age and temperature on potency of diphtheria antitoxin, by John F. Anderson; 2, Organism, pseudomonas protea, isolated from water, agglutinated by serum of typhoid fever patients [with bibliography], by W. H. Frost; 3, Some considerations on colorimetry and new colorimeter, by Norman Roberts; 4, Gas generator, in 4 forms, for laboratory and technical use, by Norman Roberts.

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