Many became fugitives, and sometimes by daring adventure returned to Africa. In order to check the fugitive slaves, Labourdounais employed their countrymen against them, and formed a mounted police who protected the colonists from their incursions.[4] To preserve the inhabitants from famine, he introduced the cassava from the Island of St. Jago and the Brazils, and published an ordinance by which every planter was compelled to put under cultivation five hundred feet of cassava for every slave that he possessed. The planters, an ignorant and indolent race, used every measure to degenerate and discredit this innovation, and in some cases destroyed the plantations of the cassava by pouring boiling water on the root. The benefit conferred by this ordinance was later felt and appreciated when their crops were destroyed by the hurricanes or devoured by locusts. The cassava was immune from either of these casualties and was the usual article of food for the Negroes. Labourdounais instructed the slaves in the art of ship building, made them sailors and soldiers and found them highly useful in the expedition which he undertook against the English in India. He endeavored also to mitigate their sufferings from the enforcement of the regulations of the _Code Noir_. After the dispersion of the pirates, the slave trade fell into the hands of European merchants or Creole colonists, who extended it to the adjoining coasts of Africa. The Mozambique Negroes were found more tractable than those of Madagascar, but Negroes were obtained from both points, according to the difficulties and exigencies of the traffic. The price paid by the French at Madagascar for a man or a woman from the age of thirteen to forty was two muskets, two cartridge boxes, ten flints, and ten balls, or fifteen hundred balls or seventeen hundred flints. In spite of the price the trade developed. In 1766 there were about 25,000 slaves and 1200 free Negroes in the colony. In 1799 there were 55,000 of the former class and 35,000 of the latter. In 1832 they were estimated at 16,000 free Negroes and 63,500 slaves. It seems difficult to account for the diminution among the free Negro population. Baron Grant de Vaux[5] states that to prevent the increase of this class it was enacted that no slaves should be liberated save those who had saved the lives of their masters. A kind-hearted master, however, could always give his slave an opportunity to save his life.