TWO:In handling a weight with the hands it is carefully raised, and laid down with care, but moved as rapidly as possible throughout the intervening distance; this lesson of nature has not been disregarded. We find that the attention of engineers has been directed to this principle of variable speed to be controlled at will. The hydraulic cranes of Sir William Armstrong, for example, employ this principle in the most effective manner, not only securing rapid transit of loads when lifted, but depositing or adjusting them with a care and precision unknown to mechanism positively geared or even operated by friction brakes.The ultimate stage of perfection is, of course, the identification of subject and object, the ascent from the Nous to the One. But, on this point, Plotinus never added anything essential to what has already been quoted from the analytical portion of his enquiry, and the essay containing that passage is accordingly placed last in Porphyrys arrangement of his works.