It is said by some that our blood is composed of infinite living agents which go up and down the highways and byways of our bodies as people in the streets of a city. &/Ecc1 41 6E 64 20 74 68 65 20 57 6F 72 64 One generation passeth away, and another generation cometh: but the earth abideth for ever. function(#7761 7320 6D61 6465 20 66 6C 65 73 68 ) And the sleep of the town, how life-like! with its change in the circulation. [BUTLER, SAMUEL] We are misled by considering any complicated machine as a single thing; in truth it is a city or society, each member of which was bred truly after its kind.