THE LUNGS. — Croupous pneumonia and broncho-pneumonia may occur as I true complications of malaria, and are , then, of course, to be considered as due to secondary infections, and not as a re sult of the specific malarial toxin. The latter may render the person more sus ceptible to pneumococcic infection by impairing the general resistance, but no more intimate relation exists between the two diseases. Of course, the condi tions already described as associated with the pneumonic form of pernicious fever in all probability depend upon the local ! ization of the parasite in the pulmonary blood-vessels and are therefore directly due to the malarial infection; but this is not a true pneumonia and is unaccom panied by the signs of consolidation.
The association of pleurisy and mala ria may occur and, as with pneumonia, is to be regarded as purely accidental and in no wise a consequence of the original infective process.
Tuberculosis.—The malarial subject is equally as liable to pulmonary tuberculo sis as the non-malarial. This is con trary to the views held by early observers, who, following the lead of Boudin (Traite des Fievres Intermittentes, Paris, '42), adopted the view that the two infections were in some manner incompatible with each other. As a matter of fact, in warm climates where malaria prevails its asso ciation with tuberculosis is uncommon because the climatic conditions are such as limit the occurrence of this infection, and in regions where tuberculosis pre vails malaria, as a rule, is infrequent. To climatic conditions, therefore, rather than to any antagonism between the two infections is to be ascribed their rela tively infrequent association in the same subj ect.