314 Messrs. R T. Glazebrook and D. W. Dye. 



\ very large in each case for a given individual, the relation between heat and 

 work is satisfied by a linear equation and can be expressed by the above 

 formula, with the difference, however, that H and \ depend on the individual 

 and are not the same for all the persons tested. Table II gives the results 

 and includes figures taken from an earlier paper in the B. A. Report for 1912. 

 The quantity A. measures the slope of the curve. 



The next step was to investigate the relation, if any, between the quantities 

 • H and A, and the weight of the man denoted by M and measured in kilo- 

 grammes. On plotting the values of X, against the mass in kilogrammes as 

 is done in fig. 3, we found that the points again lay very well on a straight 

 line and that the equation to this line was given by 



\ = 0-08 + O003M. (3) 



O 01 2 3 04 



Fig. 3. — Relation between mass M and X (slope of lines in fig. 2). 



This quantity measures the ratio of the work done to (H — H ), the heat 

 employed in doing this mechanical work, and for a man of 50 kgrm. 

 weight has the value 023 or nearly one-fourth ; the efficiency of such a man 

 is about 25 per cent. 



On plotting the values of H against M as in fig. 4 we again found that a 

 simple linear relation given by 



H = - 138 + 4-5 M (4> 



