A normal platelet count ranges from 150,000 to 450,000 platelets per microliter of blood. Having more than 450,000 platelets is a condition called thrombocytosis; having less than 150,000 is known as thrombocytopenia.
THE APPRENTICESHIP SYSTEM. The term 'emancipation' which was used to describe the Act of 1833 passed by the British Government to put an end to slavery in the British Empire, is ambiguous and misleading. Slaves were not freed in the sense that they were given unrestricted control over their freedom of movement.
Black slavery took root in the American colonies slowly. Historians now know that small numbers of Africans lived in Virginia before 1619, the year a Dutch ship sold some twenty blacks (probably from the West Indies) to the colonists. But it was not until the 1680s that black slavery became the dominant labor system on plantations there.