64 BULLETIN 583, U. S. DEPARTMENT OF AGRICULTURE. 
vert and bridge construction is to be avoided whenever possible. It 
should be noted that the exceptionally high percentage in the case of 
gutter pavements represents only an apparent advantage in this 
kind of work, as no charge is made for material which ordinarily 
would form a large part of the cost. In the Atlanta construction 
the rock was obtained from the excavation without cost other than 
that of hauling and breaking to size. 
The economy resulting from the employment of the convicts in this 
work and the high degree of efficiency with which they were main- 
tained and organized are proved by the low unit costs of the work, as 
shown by the tables of costs. That the efficiency of the experimental 
camp workers was distinctly above that of the other county squads 
was noted by all who observed them at the Lakewood fair grounds, 
where they worked side by side with representatives of other camps. 
Finally, the fact that such costs could be obtained under the severe 
conditions surrounding this experiment affords the most convincing 
proof of the soundness of the methods of organization, discipline, and 
convict maintenance employed. 
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