The Key-Note System. BY HENRY N. GUERNSEY, M.D., PHILADELPHIA. We have taken the liberty of reprinting the following admirable paper from the pen of our friend Dr. Guernsey, because, in the first place, we think that the “key-note”, as a system of simplifying the selection of the remedy, stands unequalled; and in its Hahnemannian excellence, it is simply unrivalled. Secondly, …