Page:Sir William Herschel, his life and works (1881).djvu/91

Rh brother with the twenty-foot, the sister aiding him, and at odd times sweeping for comets. In the course of her life she discovered no less than eight, and five of these were first seen by her.

In 1787 Author:William Herschel wrote his paper "On three Volcanoes in the Moon," which he had observed in April of that year. In this he mentions previous observations of the same sort. I do not remember that the following account of these has ever been put on record in English. Baron writes from London to Author:Johann Elert Bode:

"Probably you have heard also of the volcanoes in the moon, which has observed.... I will give you an account of it as I heard it from his own lips. Dr., a worthy physician in Windsor, who has made himself known through his two journeys in China, and who is a friend of our , was with his wife one evening on a visit to  in Datchet [1783, May 4]. On this evening there was to be an occultation of a star at the moon's dark limb. This was observed by  and Doctor . Mrs.  wished also to see what was occurring, and placed herself at a telescope and watched attentively.