Bartonella baciliformis is a micro-organism, which, by reason of its biological characteristics, occupies an intermediate position between Typical Rieketsia and common Bacteria. 2. Severe Anemia, or Carríon's Fever formerIy called "Oroya Fever", is the acute form of Bartonellosis. In the latter, the Bartonella forms an important colonization of the cellular system favorably to itself: furthermore, it spreads abundantly in the circulating blood. 3. During the course of acute Bartonelosis, the number of germs in the circulating blood, diminish progressively, and a similar process is set up almost simultaneously in the depth of the organs. The cells capable of armouring the virus, acquire a relative immunity, which, however, is sufficient to allow the improvement preceding the appearance of the verrugas to take place. 4. The giving off of endo-toxins, due to the destruction of the germs, p...