{"nrhp_refnum":"71000695","name":"Marshall, Humphry, House","other_names":[],"category":"building","location":{"address":"Strasburg Rd. (PA 62) at jct. of Northbrook Rd.","address_restricted":false,"city":"Marshallton","county":"Chester County","state":"PA","lat":39.95064688800005,"lon":-75.68132009799996,"geom_source":"nps_gis"},"listed_date":"1971-05-27","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Science","Architecture","Agriculture"],"significance_levels":["national"],"summary":{"what_it_is":"A stone house in Marshallton, Chester County, Pennsylvania, built in 1773 by the botanist Humphry Marshall, who was trained as a stone mason. It included a greenhouse and an observatory projecting from the second story.","why_significant":"The nomination argues the house reflects Marshall's craftsmanship as a mason and his scientific interests in astronomy and botany. It cites his role in introducing North American plant species to Europe, his botanical writings, and his civic work in founding the Chester County Almshouse and Westtown Boarding School.","narrative":"Built of carefully laid stone in 1773 at Marshallton in Chester County, Pennsylvania, the house was designed and constructed by Humphry Marshall, a botanist who had worked for several years as a stone mason before turning to other pursuits. It included a greenhouse for plants and an observatory that projected from the second story, reflecting Marshall's interest in astronomy. He also farmed, milled and planted a botanical garden on the surrounding land. Marshall traded widely in seeds and plants and introduced many North American species to Europe; a London firm ordered 1,300 plants from him in 1787 alone. His book Arbustrum Americanum was well received in the United States and abroad, and his essay Observations on Botany is considered perhaps the first American writing promoting conservation and scientific farming. He also helped found the Chester County Almshouse and the Westtown Boarding School.","period_of_significance":"1773","architect_builder":"Humphry Marshall (builder)","architectural_style":null,"criteria":["A","B","C","D"],"status_note":"Restored in 1949 by Mr. Weir, with later alterations; restoration of chimneys supervised in 1967","vacant_flag":null,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:29.816971-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/71000695.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/71000695/6394b65fc4-800.webp","url_1600":"https://nationalhistoricalregister.com/media/71000695/6394b65fc4-1600.webp","licence":"Public domain","author":"Ned Goode","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Humphry_Marshall_House,_State_Route_162_(Strasburg_Road)_(West_Bradford_Township),_Marshallton_(Chester_County,_Pennsylvania).jpg\" rel=\"noopener\">Ned Goode</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Humphry_Marshall_House,_State_Route_162_(Strasburg_Road)_(West_Bradford_Township),_Marshallton_(Chester_County,_Pennsylvania).jpg"},"district":{"nrhp_refnum":"86000056","name":"Marshallton Historic District","url":"https://nationalhistoricalregister.com/districts/pennsylvania/marshallton-historic-district-86000056/"},"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71996398","wikipedia":"https://en.wikipedia.org/wiki/Humphry_Marshall_House","wikidata":"https://www.wikidata.org/wiki/Q5941761"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/chester-county/marshall-humphry-house-71000695/"}