Life and health / by James Frederick Rogers.

  • Rogers, James Frederick, 1870-1965.
Date:
1910
Catalogue details

Licence: In copyright

Credit: Life and health / by James Frederick Rogers. Source: Wellcome Collection.

Provider: This material has been provided by London School of Hygiene & Tropical Medicine Library & Archives Service. The original may be consulted at London School of Hygiene & Tropical Medicine Library & Archives Service.

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    surface lining the food canal took upon themselves the special work of dissolving the food material, of absorbing it into their own structure, and of passing the ready- prepared foodstuff on to the outer pro- tective and food-detecting cells. So began a division of labor, and, being endowed with that greatest of gifts, the power of improvement through use, each set of cells, the outer and the inner, became more and more proficient in the work it found itself best placed to do. Division of labor, just as in society, brought with it increasing dependence of the laborers of one kind upon those of another, and failure of one set to perform their appointed task meant destruction to all, while imperfect performance of such special work meant debility and—what it still means in the most highly developed animal—ill health or sickness. So those organisms in which the various individuals and groups did their special work in a superior way prospered, and could even