1873. This remarkable treatise is a translation from one of the numerous works of the Arabian philosopher, Abou Hamid Mohammed ben Mohammed al Ghazzali, who flourished in the 11th century. Mohammedan scholars of the present day still hold him in high respect. This treatise on the alchemy of happiness is well-adapted to extend our knowledge of the writings of Ghazzali and of the opinions current then and now in the Oriental world. In form, the book contains a treatise on practical piety and the author finds a place for observations reaching far wide of his apparent aim, making many observations which develop his notions in anatomy, physiology, natural philosophy and natural religion.