{29} Other local inflammations occasionally arise in the course of acute rheumatism: pneumonia is one of the most frequent; left pleuritis is not infrequent, and is doubtless often caused by the extension of a pericarditis; but both pneumonia and pleurisy are occasionally double in rheumatic fever. Severe bronchitis is observed now and then, and very rarely peritonitis, and even meningitis. These several affections, together with delirium, coma, convulsions, chorea, and hyperpyrexia, which are likewise occasional incidents of the disease, will be considered under the head of non-articular manifestations and complications of acute articular rheumatism.[27] [Footnote 27: See observations of W. S. Cheesman, M.D., _New York Medical Record_, Feb. 25, 1882, 202.] Some of the symptoms of acute articular rheumatism need individual notice. The temperature in acute articular rheumatism maintains no typical course, and usually exhibits a series of exacerbations and remissions, which correspond closely in time and degree with the period, duration, and severity of the local inflammatory attacks. As a very general rule in average cases, the temperature attains by the end of the first or second day to 102° F., and while the subsequent evening exacerbations may reach 104°, 104.4°, or very rarely 105°, yet in the great majority of cases the maximum temperature does not exceed 103° F., and in a very considerable number falls short of 102°. An analysis of one of Dr. Southey's tables[28] shows that in 84 cases of acute rheumatism 1 attained the temperature of 105.8°; 8, that of 104° to 105°; 15, that of 103° to 104°; 32, that of 102° to 103°; 17, that of 101° to 102°; 10, that of 100° to 101°; and 1, that of 99.8°; that is, the temperature was below 103° in five-sevenths, and below 104° in about ten-twelfths, of the whole. In very mild cases, in which but a few joints are inflamed, and only to a slight degree, the temperature may not reach 100° at any time, and there may be intervals of complete apyrexia. On the other hand, in a few rare severe cases of rheumatic fever, especially when complicated with pericarditis, pneumonia, or delirium, or other disturbance of the cerebral functions, the temperature attains to 106°, 108°,[29] 109.4°,[30] 110.2°,[31] or even 111°,[32] or 112°. Such cases are now spoken of as examples of rheumatic hyperpyrexia. [Footnote 28: _St. Bartholomew's Hospital Reports_, xiv. p. 12.] [Footnote 29: Weber, _Clinical Society's Trans._, vol. v. p. 136.] [Footnote 30: Th. Simon, quoted by Senator, _Ziemssen's Cyclop. of Prac. Med._, xvi. p. 46.] [Footnote 31: Murchison and Burdon-Sanderson, two cases, _Clinical Society's Trans._, vol. i. pp. 32-34.] [Footnote 32: Ringer, _Med. Times and Gaz._, vol. ii., 1867, p. 378.] There is no rule about the mode of invasion of this high temperature. It may ensue gradually or suddenly, the previous range having been low, moderate, or high, steady or oscillating.