The medical practitioners, who are well acquainted with the general state of health of the population surrounding the prisons concur in vouching to the fact, upon their own knowledge, that the health of the prisoners is in general much higher than the health almost of any part of the surrounding population; that the prisoners, as a class, are below the average of health when they enter the prisons; that they come from the worst neighbourhoods; that many of them come from the lodging-houses, which, in those towns, as will be shown, are the constant seats of disease; that they are mostly persons of intemperate habits; that many of them come in in a state of disease from intemperance and bad habits; and notwithstanding the depressing influence of imprisonment, the effect of cleanliness, dryness, better ventilation, temperance, and simple food, is almost sufficient to prevent disease arising within the prison, and to put the prisoners in a better working condition at the termination than at the commencement of their imprisonment. At the Glasgow bridewell, the prisoners are weighed on their entrance and at their discharge, and it is found that, on the average, they gained in weight by their imprisonment.[33] At Edinburgh, there were instances of poor persons in a state of disease committed from motives of humanity to the prison, that they might be taken care of and cured. The tables are to be taken as showing imperfectly the comparative effects of the different circumstances; because, when a labourer is obliged to leave work he loses wages; and it is known of large classes of them, that they often work improvidently and injuriously to their chances of recovery by continuing at work in impaired health too long; the prisoner, on the contrary, by absence on the sick list, gains ease and exemption from slave labour; and the officers have constantly to contend against feigned sickness to avoid task-work and punishment. It should also be noted that a large proportion of the sickness of the prisoners is of a character that is excluded from all tables of insurance, from the benefit societies as being specially excluded from their benefits. The numbers imprisoned at the lower ages, or above 36 years of age, were too few to form any comparison:—