November (1870) 9 December 22 January (1871) 48 February 80 March 176 April 349 May 430 June 648 July 532 August 528 September 490 October 600 November 660 December 671 January (1872) 445 February 256 March 151 April 117 May 76 June 33 July 18 August 10 The disease was unusually severe and virulent; fifteen per cent of the patients died in the hospitals. The total number of deaths[270] in the year 1871, when the population of the city was 826,341, was 5,212, or 63·1 per 10,000 inhabitants; thus the total mortality, which in the years 1867–70 had been 31·8 per cent (including the still-births), reached the prodigious height of 40·4 per cent. The cause of the wide dissemination of small-pox in Berlin was the fact that large numbers of people, including children, had never been vaccinated, and only a few had ever been revaccinated. According to a rough estimate made by Guttstadt, of Berlin’s total population in the year 1871 some 20,000 people had never been vaccinated, 530,000 had been vaccinated only once, and only 270,000 had been revaccinated; fourteen per cent of those who had never been vaccinated, two per cent of those who had been vaccinated once, and O·5 per cent of those who had been revaccinated, contracted the disease. In the garrison, which averaged 9,110 men, only 57 cases of the disease and 4 deaths were reported between July 1, 1870, and June 30, 1871. But few prisoners were taken to Berlin; only 24 prisoners suffering from small-pox were committed to the lazarets, and of these only 4 died; the first two cases were in August and September.