Free and impartial remarks on the real importance of the whale fishery : In a letter to a member of Parliament. Wherein the several national encouragements which have been given to it, are considered; the causes of their failure of success, pointed out; and the means suggested, by which they may be rendered effectual. Interspersed with notes, containing a more perfect description of the fish; the manner of taking it; the nature of the finns; and other matters relative to the subject, than has hitherto been published. By a Merchant.