Autograph Letter Signed to unnamed male correspondent.

12mo, 2 pp. good, on aged paper, but with slight damage along the inner edge as a result of removal from stub. Text entirely legible. Docketed 'Professor Tyndall' in a contemporary hand at foot of second page. He wishes he 'could respond to half the invitations for which I am indebted to the kind acts of my friends'. The 'duties now pressing' on him 'render this literally impossible'. 'All I can do under the circumstances is to wish success to your young society'.