22nd. Jan. 1862.
Dear Maskelyne
Your “lens” illustration is altogether defective,1 but if even shown to be so, another, I doubt not would be found; and unhappily for me I have not the time necessary to argue the case out.
I send by this post a letter to the Trustees;2 it is rather with a view of excusing my own boldness than with the hopes of removing the obstacles which oppose the granting of my request.3 Do not I beg of you give yourself any further trouble on my account in connexion with this subject.
Yours truly | John Tyndall
Natural History Museum DF15/2
Please cite as “Tyndall1859,” in Ɛpsilon: The John Tyndall Collection accessed on