Recent accounts from California bring intelligence of a most fervid excitement having been caused in San Francisco by reports of very rich gold placers having been discovered on Frazer river, north of Oregon, in the British possessions. It is stated that large companies have left California for the new gold regions, which are very extensive. In Iowa, gold has lately been discovered in several counties, but we believe it is not plenty, and that it will scarcely pay fifty cents per day for digging and washing. A correspondent, alluding to the gold field of Iowa in which he has been laboring, says " three days of exploration with a spade, had enabled him to discover several small grains of gold and several tuns of exaggeration."