Before the earliest of the inventions of spinning by machinery, the weavers were gathering to the towns of Yorkshire, Lancashire and other counties north of the Trent. The spinning-jenny of Hargreaves was wrecked by a Blackburn mob in 1768, and a mob wrecked the cotton-mill built by Arkwright at Chorley eleven years later. This was decidedly a time of movement from the country to the towns, a movement which preceded the spinning ingenuity of the sixties and may have been stimulated by the earlier use of the fly-shuttle in weaving. Much of the country round Manchester, though it doubtless retained those farm-houses, hedgerows, and field paths which come into the idyllic opening of ‘Mary Barton’ more than half a century later, was “crowded with houses and inhabitants,” as Percival says: so populous were the environs of Manchester that every house in the township had been found by a late survey to contain an average of six persons. The proportion of deaths was less than in 1757; but that was chiefly due to the accession of new settlers from the country, which raised the ratios of marriages and births[257]. Manchester had increased from a population of about 8000 in 1717 to one of 19,839 (inclusive of Salford) in 1757. When the inhabitants were next counted in 1773, they were found to be 22,481 in Manchester (5317 families in 3402 houses) and 4765 in Salford (1099 families in 866 houses). According to Percival, who gives these figures, the death-rate in 1773 was 1 in 28·4, the births exceeding the deaths by forty in a year. The poor, he says, were now better lodged, and some of the most dangerous malignant distempers were less violent and less mortal. Manchester, however, was still an unhealthy place compared with the country, especially to young children. Thus, the thirty-one townships in the parish of Manchester contained, exclusive of the city, 13,786 inhabitants (2525 families in 2371 houses), and of these only 1 in 56 died annually (compared with 1 in 28 in the city)--the births being to the deaths as 401 to 246 in the year 1772. Again, the bleak upland parish of Darwen with a population in the year 1774 of 1850 souls mostly occupied in the cotton manufacture, had, during the seven years before, more than twice as many baptisms as burials (508 to 233), the birth-rate (1 in 25·5) being high and the death-rate (1 in 56) low.