“On the contrary, Mr. Erskine, when treating of our actions of separation as distinguished from divorce a vinculo matrimonii , says, that “the Judge will, on proper proof, authorize a separation a mensâ et toro a mensâ et toro , and award a separate alimony to her, suitable to her husband's fortune, to take place from the time of the separation, and to continue till there shall be either a reconciliation between the parties, or a sentence of divorce.”