[39] Maximum concentration obtainable.
[40] Maximum concentration obtainable.
[41] Maximum concentration obtainable.
[42] Maximum concentration obtainable.
[43] This material is adapted from a lecture by Gen. Fries before the students of the General Staff College, in Washington, May 11, 1921.
Transcriber’s Notes:
The cover image was created by the transcriber, and is in the public domain.
The illustrations have been moved so that they do not break up paragraphs and so that they are next to the text they illustrate.
Typographical and punctuation errors have been silently corrected.