A large amount of very valuable data had been obtained, which enabled us to know, for many kinds of labor, what was a proper day^s work. It did not seem wise, however, at this time to spend any more money in trying to find the exact law which we were after. Some years later, when more money was available for this purpose, a second series of experiments was made, similar to the first, but somewhat more thorough. This, however, resulted as the first experiments, in obtaining valuable information but not in the development of a law. Again, some years later, a third series of experiments was made, and this time no trouble was spared in our endeavor to make the work thorough. Every minute element which could in any way affect the problem was carefully noted and studied, and two college men devoted about three months to the experiments. After this data was again translated into foot-pounds of energy exerted for each man each day, it became perfectly clear that there is no direct relation between the horse-power which a man exerts (that is, his foot-pounds of energy per day) and the tiring effect of the work on the man. The writer, however, was quite as firmly convinced as ever that some definite, clear-cut law existed as to what constitutes a full day^s work for a first-class laborer, and our data had been so carefully collected and recorded that he felt sure that the necessary information was included somewhere in the records. The problem of developing this law from the accumulated facts was therefore handed over to Mr. Carl G. Barth,
