An Act for encouragement of the silk manufactures of this kingdom : and for taking off several duties on merchandizes exported; and for reducing the duties upon beaver skins, pepper, mace, cloves, and nutmegs imported; and for importation of all furs of the product of the British plantations, into this kingdom only; and that the two corporations of assurance, on any suits brought on their policies, shall be liable only to single damages and costs of suit.