THE RESPIRATORY SYSTEM 151 
season ' ' for man. This I am inclined to interpret as con- 
nected with the larger number of visitors during that 
season. Doctor Weidman was further able to show that 
the only real examples of lobar fibrinous pneumonia 
strictly comparable to the human infection occurred in the 
Primates. I have uncovered one in a lemur and one in a 
carnivore. The pneumococcus has been far and away the 
greatest producer of our pneumonias, in two typed cases 
being of the IV variety. There will be given below a 
summary of the pathological types of pneumonia en- 
countered, to be followed by some notes upon the prin- 
cipal gross and minute anatomy in special orders. Table 
9 will show the numerical distribution of types among 
the orders. All the principal mammalian orders are 
represented while the birds seem relatively less sus- 
ceptible to the disease and, except the Passeres, show a 
trifling incidence. 
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 ; unfortu- 
nately 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 descrip- 
tion, passes through the septum to the adjoining alveolus. 
There were two cases, a Chimpanzee (Pan niger) and 
a Galago {Galago malioli) 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 cellulo- 
edematous semisolid sections showing a sanguineous 
exudate, fewpolynuclear cells and many swollen epithelia. 
The microscopic picture of the bronchocatarrhal pneu- 
