It is a matter of record that a man has run between Milwaukee and Chicago, a distance of 80 miles, in about fifteen hours. Such an amount of work would have required over 9000 calories for the day. These calculations are all based upon experimental results obtained in various laboratories in different parts of the world and can be accepted as being free from any gross error. It is evident that the energy requirement is proportional to the amount of mechanical energy expended. One may turn now to the fuel needs in terms of calories in certain industrial pursuits. According to Becker and Hamalainen, the quantity of extra metabolism per hour required in various pursuits is as follows: Extra calories of metabolism per hour due to occupation Occupations of women: Seamstress 6 Typist[5] 24 Seamstress using sewing machine 24-57 Bookbinder 38-63 Housemaid 81-157 Washerwoman 124-214 Occupations of men: Tailor 44 Bookbinder 81 Shoemaker 90 Carpenter 116-164 Metal worker 141 Painter (of furniture) 145 Stonemason 300 Man sawing wood 378 [5] Observation of Carpenter. To use this table one may seek the basal metabolism of the individual, add 10 per cent. for sixteen hours of wakefulness when the person is sitting or standing, and then multiply the factors in the last table by the numbers of hours of work. For example, if one takes the individual weighing 156 pounds, one obtains the following requirements of energy if his business were that of a tailor and he worked eight hours a day: Calories Sleeping 8 hours at 70 calories per hour 560 Awake 16 hours at 77 calories per hour 1232 Add for work as tailor 8 hours at 44 calories 352 ---- 2144 After this fashion one might calculate his food requirements had he followed occupations other than that of tailor: Calories of metabolism Occupation per day Bookbinder 2440 Shoemaker 2510 Carpenter 3100 Metal worker 2900 Painter 2950 Stonemason 4200 Man sawing wood 4800 These figures make no allowance for walking to or from the place of employment.