The Tubercle Bacillus
Dr. A. C. Fontes submitted to the Medical and Surgical Society some cultures of the tubercle bacillus. These specimens, after being kept for thirty-one months in the ordinary environment, lost completely their growing power. The addition of broth and a stay in the incubator brought back the power to develop subcultures and the old virulence.Fontes also described the staining method designed by Dr. Barbosa de Cunha. The material is emulsified on the slide with a drop of xylene. After this evaporates, and after heat fixation, the preparation is treated with Ziehl-Nielsen's solution.
Plasmodium Vivax and Plasmodium Falciparum
Dr. Aben-Athar has noticed at Para an alternation of Plasmodium vivax and Plasmodium falciparum. The proportion of malarial fevers is constant there and the two parasites prevail evenly in the year as a whole. However, their monthly distribution varies a great deal, and as one increases in frequency the