CIRCULATION

Evening Post, Volume CXV, Issue 25, 31 January 1933, Page 5

CIRCULATION

Blood and'lymph are not. the onlyliquids that circulate through the body, Dr. G-. H. Parker, of Harvard University, informed the 'U.S. National Academy of Sciences at a meeting given largely over to the biologists, physiologists, geologists, and botanists. He has discovered that soluble oil, .pro.bably lipoids, also pass through the tissues. Thus tie explained some discolourations as well as some poisons which seem" to creep through a finger until they affect a whole arm. Some fish have the property of .changing their colour to toatch their surroundings. Dr. Parker cut the nerves controlling the change in the tail of one and tho colour changed, though slowly. He also injected the juice of a light-coloured fish into a lark-coloured one and produced a light spot. The change occurs so slowly that the blood circulating system could play no part in it. Dr. Parker therefore assumes that what he calls "neurohumoral substance" passes from cell to cell, the word "humour" being used in its old sense .of ;• "state" or '^condi.tion." Apparently this neurohumoral substance is discharged by nerve terminals and is conveyed from cell to cell. In Dr. Parker's opinion, the neurohumoral system is far, older than that of the veins and arteries that carry blood. In low marine animals, such as corals and'sea anemones, there is no blood but there is this neurohumoral transference of liquid.

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