Williams, C. L. (1928). Growing the scientific attitude of mind in the youth. In C. L. Williams, Adding a new dimension to education (pp. 110-112). San Francisco, CA, US: California Press.
http://dx.doi.org/10.1037/14876-017
It was not until near the close of her six years of teaching for us that I came to understand fully what our first instructor in Chemistry and Physics was striving for. Although I knew that her students loved their work and acquired through it an insight into scientific method rarely found in boys and girls of their age, I have been impatient when, as sometimes happened, a student did not cover the prescribed number of experiments in the school year. But if I urged pressure, always her answer was that scientific training is a matter of growth and development, and not of experiments, and that time is an essential element in that growth. (PsycINFO Database Record (c) 2016 APA, all rights reserved)