The annals of Barker, of Coleshill, are full of references to agues, among other fevers, from 1780 onwards. Under 1781 he writes:—
“This spring that very peculiar, irregular, dangerous and obstinate disease, the burning, or as the people in Kent properly enough called it, the Plague-ague, made its appearance, became very epidemical in the eastern part of the kingdom, and raged in Leicestershire, the lower part of Northamptonshire, Bedfordshire, and in the fens throughout the year.... This strongly pestilential disease had such an effect upon them that the complexion of their faces continued for a time as white as paper, and they went abroad more like walking corpses than living subjects.”
As many as five persons in an evening were buried from it in some large towns in Northamptonshire; and about Boston it was so general and grievous that out of forty labourers hired for work in harvest, half of them, it was said, would be laid up in three days[673]. In 1783 the “pestilential agues” were as bad in Northamptonshire and eastern parts as the year before. A Liverpool writer says:
“In the autumn of 1782 the quartan ague was very prevalent on the opposite shore of the river in Cheshire: it was universal in the neighbourhood of Hoylake, where many died of it. Yet it was scarcely heard of in Liverpool, although from the uncommon wetness of the season it prevailed throughout the kingdom[674].”
On October 25, 1783, a correspondent of the Gentleman’s Magazine offered an explanation of the “present epidemic disorder, which has so long ravaged this country, and that in the most healthy situations of it,” namely, “the putrescent air caused by the number of enclosures, and the many inland cuts made for navigation[675].” Next year, 1784, appears to have been the principal season of epidemic agues on both sides of the Severn valley, one practitioner at Bridgenorth making them the subject of a special essay[676].
It was at this time that Fowler brought into use his solution of arsenic as a substitute for bark in agues, the latter having notably failed in the epidemics since 1780.
Baker says: “The distinguishing character of this fever was its obstinate resistance to the Peruvian bark; nor, indeed, was the prevalence of the disease more observable than the inefficacy of the remedy:” in that respect the epidemic agues had belied the experience with bark in ordinary agues. Again, it is singular that bark had failed most, and arsenic been especially useful in those parts of England where ordinary malarious agues were never seen. One practitioner in Dorset laid in a large stock of arsenic, wherewith he “hardly ever failed to stop the fits soon[677].” Another, at Painswick, in Gloucestershire, used it successfully in two hundred cases of epidemic agues from 1784 onwards. He gives the following account of these unusual agues at Painswick:
“This town, which is situated on the side of a hill, and is remarkable for the purity of its air, is very populous. In the year 1784 the epidemic ague, that prevailed in many parts of the kingdom, made its appearance in this place, and has continued till the present time [Nov. 1787], although previously to that period the disease was hardly ever seen here, unless a stranger came with it for the recovery of his health, on account of the healthy situation of the place. It affected whole families, and appeared to be most violent in spring and autumn. In the summer of 1786 it was followed by a fever of the kind called typhus, or low nervous fever, which not unfrequently degenerated into a putrid fever and proved very fatal[678].” In May, 1785, at a general inoculation of smallpox, “many had been afflicted with intermittents of several months’ duration attended with anasarcous swellings[679].”
It will be seen from the following table of cases treated at the Newcastle Dispensary, under the direction of Dr John Clark, during twelve years from 1 October, 1777, to 1 September, 1789, that influenza makes the smallest show among them, being far surpassed by the intermittent fevers and dysenteries, while all three together are greatly exceeded by the perennial typhus fever:
| Cases treated | ||
| Putrid fever | 1920 | |
| Intermitting fever | 313 | |
| Epidemic dysentery in 1783 and 1785 | 329 | |
| Influenza of 1782 | 53 |