Primates present a definite group of variations from the other orders, notably in having four clear cases of lobar fibrinous pneumonia, and in certain histological findings. In reference to the lobar cases, a review of their history does not indicate that any might have been surely diagnosed by their symptoms, and only possibly by signs in one case during the stage of red hepatization; unfortunately no temperature records are at hand. In one case it was possible to see a group of alveoli with the fibrin collected in a strand which, according to classical description, passes through the septum to the adjoining alveolus. There were two cases, a Chimpanzee (_Pan niger_) and a Galago (_Galago maholi_) with a microscopical picture suggestive of those we met in the influenza epidemic, and indeed the lung of the former resembles grossly the lung of influenza pneumonia. The spotty areas of watery purple color correspond under magnification to celluloedematous semisolid sections showing a sanguineous exudate, few polynuclear cells and many swollen epithelia. The microscopic picture of the bronchocatarrhal pneumonias shows conspicuously thickened septa decidedly wider than one is accustomed to see in human cases and apparently due more to round cell infiltration than to congestion or polynuclear increase. Bronchopneumonia or capillary bronchitis with zones of cellular edema in the vicinity is a rather usual picture in the deaths from degenerative bone disease. It cannot be said that there is anything very peculiar about it, although a frequent note met in the autopsies describes spotty areas of hemorrhage and nearby atelectasis. The case of lobar pneumonia found in a ring tailed lemur (_Lemur catta_) showed very delicate fibrinous reticulum and relatively few cells in the exudate, a picture apparently due in part to beginning resolution since the whole upper left lobe was in a stage of gray hepatization. The peculiarity of the Carnivora seems to lie in the reaction of the epithelia, these cells being quite large, swollen and occasionally much vacuolated. Such a picture was most pronounced in the terminal bronchitic pneumonias in cases which might be called distemper. Many instances of pseudolobar catarrhal or bronchopneumonia are recorded but we also observed the fibrinous lobar form at the stage of red hepatization in a Texas skunk (_Mephitis mesomelas_). Concerning the orders Rodentia and Edentata no especial notes seem necessary for their inflammatory reactions are essentially like the others in that epithelial cells are much swollen and prominent.