Pneumonia
2 of the 7 encyclopedias on this shelf carry an entry for Pneumonia. Both are reproduced below, so you can see where they agree and where they differ.
Collier's New Encyclopedia (1921)
inflammation of the lung, usually caused by exposure to cold draught or chill after beor wet, a cold ing over-heated, injury to the chest, irsecondary affection in ritation, or as a or puerperal fever, and smallpox, typhoid wasting diseases; it may also other low congestion be caused by long continued particularly in of the lung substance, , or in old and weak people heart disease cause who are bedridden from any . in reso- Pneumonia terminates generally lution and recovery, but sometimes in and exhaustion. death from collapse PO, the largest river of Italy, rises on Monte Viso, one of the Cottian Alps, at close to the an altitude of 6,405 feet, for upward French frontier. It flows E. before Saluzof 20 miles, when, arriving rocky defiles and a minute, zo, it emerges from its which claim enters upon the plain. From Saluzzo it ; and it is claimed engi- flows N. N. E. past Turin to Chivasso some have a much there it changes its course toward the to its emneers that valveless types liable to get E., in which direction it flows longer life tools vary bouchure in the Adriatic. Upward of out of order. The percussion hammer to 55 miles from its mouth, above Ferrara, in size from a weighit begins to form its delt from N. to S. The delta is rapidly growdelta, 60 miles wide Ravenna, a city once on ing in area. the seashore, now stands 4 miles inland. from the left the Ticino, The Po receives Adda, Mincio, and other streams and right the Trebbia and others. from the of 360 miles, and It has an entire length square drains an area of nearly 28,900 miles.
Aiton's Encyclopedia (1910)
a bacterial disease of the lungs. A severe inflammation of the lungs following exposure, together with general exhaustion of the body, affords favorable conditions for the rapid multiplication of bacteria. The bacteria produce a poison. The first symptom is a chill, which is followed rapidly by fever. Once under way an attack of pneumonia cannot be checked before it has had its natural run of ten or eleven days. In the meanwhile the patient needs to keep up strength. The fever may be kept down and the action of the heart stimulated. Unless the forces of nature win out and exterminate the bacteria, the poison causes heart failure and death. Pneumonia is a city disease. It is on the increase in American cities. "Half of the children who die under the age of five die of it."