Astronomy: a young astronomer in his study, talking with his sister, who holds a book in her lap. Engraving by C. Grignion after S. Wale.

Licence: Public Domain Mark

Credit: Astronomy: a young astronomer in his study, talking with his sister, who holds a book in her lap. Engraving by C. Grignion after S. Wale. Wellcome Collection. Source: Wellcome Collection.