TO DR. HUGGINS, F.R. S.

                                                          11 Scroope Terrace, Cambridge, 2d May 1872.

     MY DEAR SIR—Toby and I enclose our photographs with our best regards to you and Kepler. I had   intended to be in London tomorrow, but I am busy here. I hope the air-pump has recovered its cohesion. There  seemed to be a solution of continuity between the mercury and the glass.—Yours very truly,

                                                                                          J. C. M.