The currency question [electronic resource] : : the confidence of "The Times" in its own monetary doctrines exemplified, by its refusal to give publicity to a free offer of the sum of one hundred guineas to any man who may be able to maintain their validity before a competent and impartial tribunal : a rejected letter to the editor of "The Times," on the subject of the currency : to which is added the above-named offer repeated, failing the acceptance of a challenge to "The Times" to discuss the subject for the sum of five hundred guineas / by John Gray