Letter from C [Charles] Pritchard, Hurst Hill, Freshwater, I W [Isle of Wight] to Sir John [Frederick William Herschel] He encloses a letter from Mr [Warren] De La Rue on the willow leaf formation of the Sun's photosphere. He thinks it of peculiar value. He does not agree on the difficulty of seeing them, it is the eyepiece which mainly does the work. 27 October 1863