Letter, from Colonel Sir John Herschel to A. [Alexander Herschel?] Letter from Colonel Sir John Herschel likely addressed to his brother 'A', Pr. Alexander Herschel, mentioning the beginning of the project, dated December 6th 73. The letter seems to describe the involvement of 'W', William Herschel and Colonel Sir John at the beginning of the copying project. 6 December 1873