... LEITH MARKETS-Avc. 20. FLAX.-The demand has been regular during the week, but prices have somewh~t declined. Contracts have been entered into to deliver Petersburgh 10 Head at 73s. HemP-remains aslaet sated. TALLOW-hSS been a good deal inquired after; 82s. has been refused Or considerable lots of Yellow Candle, and a few small parcels have been sold at 85s. AsZ1 s-have been sought after on ...