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Over time, these changes in physiol­ogy are compounded in ways that may be hastening millions of people to an early grave.

For details and figures respecting callus, see Sorauer, Physiol. of Plants, p.

Jour. de l'Anat. et de Physiol.

Science and Journ. of Physiol.; to C. F. W. Krukenberg’s Vergleichende physiologische Studien from 1879 onwards, and to his Vortr�ge.

Morph. und Physiol. der Pilze,” ii.