FROM C. J. MONRO, Esq.

                                                                                Hadley, Barnet, N. 
                                                                                23d October 1861. 

     Thank you much for the papers. That about vortices I had skimmed already in the magazine. I shall now be able to    do more than skim it. The coincidence between the observed velocity of light and your calculated velocity of a    tranverse vibration in your medium seems a brilliant result. But I must say I think a few such results are wanted   before you can get people to think that, every time an electric current is produced, a little file of particles is   squeezed along between rows of wheels. But the instances of bodily transfer of matter in the phenomena of  galvanism look like it already, and I admit that the possibility of convincing the public is not the question.