68 
EMPLOYMENT PSYCHOLOGY 
certain stated times for examination, know to their regret 
what a genuine difficulty this is. A laboratory stationed in 
the immediate vicinity of those to be examined makes it 
very easy to get the right subject at the right time, and 
saves thereby an endless amount of confusion and effort. 
Thirdly, a stationary laboratory, with its pretentious equip 
ment and its striking contrast with the shops, would tend 
to upset a subject who knew nothing about such matters, 
and thereby lessen the value of the results of the experi 
ment. A laboratory set up in the shop does not entirely 
avoid this difficulty, but certainly reduces it to a minimum- 
Finally, a laboratory of this kind keeps the experimenter 
in the shop most directly affected, and no condition is 
more important to the successful conduct of an experi 
ment than a very intimate contact with the ways and 
work of the shop in which it is being conducted.