a commemorative street nameplate in memory of William Crabtree was unveiled at the junction of Lower Broughton Road and Priory Grove. This site marks the location that is thought most likely to have been the home of Crabtree and his family at the time when he was collaborating with Horrocks. A commemorative plaque was erected in 2005 a few yards away near Ivy Cottage, which is thought to be the house from which Crabtree made his observations. Clowes family become the landowners; early 19th century In 1772 the Manor of Broughton became the property of Mary, sister of Edward Cheetham of Nuthurst and Smedley who was married to Samuel Clowes. The manor then descended through the Clowes family to the Captain Henry Arthur Clowes. By 1801 the population of the township of Broughton with Kersal was 866. Much of the land was owned by the Clowes family of Broughton Old Hall and the Byroms of Kersal Cell, and was either farmed, or supported cottage industries such as spinning and weaving. Broughton Park, which stretched from Singleton Road to Broom Lane with Broughton Old Hall at the centre, was the estate of the Clowes family. The highlight of the year was the Kersal Moor Races held during Whit Week when the Kersal area became a giant fairground. Archery was also a popular sport for which the Broughton Archers were renowned countrywide. During the 19th century the population rose rapidly with the Clowes family controlling the development of the area allowing the wealthy merchants to purchase large plots in Higher Broughton to build their mansions and some grand terraces. By the mid-19th century the majority of residents who lived in the area known as "the Cliff" were members of the professional classes but a number of merchants also resided there. The Cliff was one of the earliest residential suburbs for "commuters" into Manchester and Salford. A number of the houses built for them still stand today and are protected as listed buildings. In 1838 Manchester Zoological Gardens were opened on a site between Northumberland Street and Broom Lane but the venture was not a commercial success and closed 1842. Businessmen from all over Europe and the Mediterranean Sea established branches in Manchester close to the source of supply. In Higher Broughton by mid century there were many prosperous merchants from the Ottoman Empire who had settled around Northumberland Street and by 1861