6 INTRODUCTION 
as follows: First, $250.00; second, $100.00; third, 
$75.00; fourth, $50.00, and fifth, $25.00. Quite a num- 
ber of competing essays were received from several 
different countries, and the best of them will be found 
in this volume. 
Naturally, it was not the intent of this contest to 
find a means of disposing of $500.00 amongst five es- 
sayists, but rather to gather together a number of 
efforts from different sources in order that they might 
be made available for the clientele of The Harrower 
Laboratory and such physicians as might care to avail 
themselves of this opportunity to get some additional 
suggestions in this special line of study. 
It must be understood that each subject is consid- 
ered from an entirely different viewpoint, because 
each essay is prepared by a different person, whose 
interests, medical environment and literary facilities 
differ very materially. In some instances there may 
be a slight redundancy because it happens that sev- 
eral writers may be discussing the same subject and 
necessarily must repeat certain fundamentals that 
would be found in another paper on the same subject. 
This repetition, to my mind, is an advantage, because 
in this way the fundamentals are reiterated and the 
impression that they may make becomes the more 
lasting. 
It has been decided to extend another invitation to 
physicians, both here and abroad, to contribute essays 
in another similar contest for which the same amount 
—$500.00—divided in the same manner, will be offered 
in 1921. The rules of this contest will be identical 
with this year and printed instructions and an indi- 
vidual contest number will be sent to any interested 
physician on request prior to June 30, 1921. It is 
planned to close the contest at the end of September 
and to announce the prize winners before the end of 
the year. 
