Letter from C [Charles] Pritchard, Clapham to Sir John [Frederick William Herschel] Herschel's boy comes home in better intellectual and moral order. He has been through differential and integral calculus and he has surprised Pritchard by his aptitude and comprehension. If Herschel could find time to initiate him into the practical spirit of finite differences, it would be effective. His position is in the lower part of the first class of Classics and he is going on favourably. Pritchard continues the assessment and hopes that Sir John and Lady Herschel will be pleased in the boy's progress. 19 June 1848