Advertisement. The Dublin Society has ordered the following account of the extraordinary produce of flax-seed, to be published, in order to let people see what increase and profit they may expect, if they sow their flax-seed thin, and manage their gronnd and flax in the proper manner. Philip Ward, living within two small miles of Belturlet in the country of Cavan, sowed in the beginning of last May, but two bushels and half a peck of flax-seed on one plantation acre, and hade a returne of twenty two bushels of clean good seed.