Marden, O. S., Merrill, J. B., Lindsey, B. B., Northrop, A. R., Blumenthal, G. A., & Weaver, E. W. (1913). The skin and the breathing apparatus. In O. S. Marder, J. B. Merrill, B. B. Lindsey, A. R Northrop, G. A. Blumenthal, & E. W. Weaver, The uplift book of child culture (pp. 163-167). Philadelphia, PA, : Uplift Publishing Company.
http://dx.doi.org/10.1037/14544-031
The skin is an important member of the family of organs that excrete, or throw off, impurities. With a small magnifying glass you can show the child the pores of the skin; little mouths that are constantly-discharging useless matter filtered out of the blood. If waste matter is retained in the body, instead of being thrown off, poisoning results, so these busy little openings in the skin must be kept free and clean at all times. It is unwise to terrify a small child with too much knowledge of germs, tiny enemies that may convey all sorts of diseases, but sufficient information should be given to impress the lesson of personal cleanliness. This chapter discusses cleanliness, bathing, and hygiene of children, as well as proper breathing. (PsycINFO Database Record (c) 2016 APA, all rights reserved)