396 



Prof. J. S. Macdonald. 



with the accomplishment of the movement in the course of which it is 

 performed. So far the use is simple, and may be expressed in symbols as 

 follows: Let K equal the work done, and x + ~K the heat production, the 

 incremental efficiency is the ratio fZK/c? (.r + K). When the total efficiency 

 of -work performance is dealt with, then x must be considered as split up 

 into fractions y + z, where z is equal to 0K, and where y is "everything 

 else" that has no relation to K, in this case the ratio is K/(<£K + K). When 

 later " everything else " is dealt with, some simplification ensues, since for the 

 purposes of this paper — for reasons better explained in the conclusion, when 

 the results obtained by such a method of procedure have been examined and 

 found in order — " everything else " which is left of .the heat production 

 when <£K has been subtracted is considered in its entirety as the " cost of 

 movement," no attempt whatever being made to treat it as if again 

 analysable into fractions such as are required by the conventional view 

 that a part of it is " resting metabolism," and only the remainder associated 

 with movement. However, it is in this latter case, in reference to move- 

 ment, most difficult to estimate the prevalent efficiency, because of the 

 impossibility of directly measuring the work done in movement, but it will 

 be seen that there is promise that an analysis of the " cost of movement " 



Data of Groups B and D reprinted in Abbreviated Form from the 

 Preliminary Communication. * 



Date, 1913. 



" Stripped 

 weight." 



Revs, per 

 minute. 



Name. 



Heat production in 

 kalories per hour. 



Group B. — Standard rate of movement 60 revs, per minute, associated work 



19 kals. per hour. 



II 

 III 

 IV 

 V 



I 



»{ 



III 

 IV 

 V 

 VI 



January 28, 29... 

 February 3, 4, 5 



February 17 



March 3 



March 4 



March 5 



54-6 



60 



Bennett 



193 



62-1 



59 -8 



Kemp 



218 



50-3 



60 



Gamm 



197 



60-5 



60 



Eae 



212 



43 -7 



60 



Armstrong 



177 



Ghvup D.- 



-Standard rate 60 revs, per min., associated work 56 kals. 

 per hour. 



February 18, 26 ... 

 January 27, 30, 31 

 February 13, 19 ... 



February 20 



February 21 



February 24] 



February 25, 28 ... 



62 -1 



60 "3 



Kemp 



350 



| 54-6 



59 -8 



Bennett 



335 



60 -5 



60 -4 



Eae 



347 



60 -4 



60 -5 



Hill 



345 



68 -3 



60 -6 



Sharrard 



352 



43 -7 



60 -4 



Armstrong 



346 



* ' Eoy. Soc. Proc.,' loc. est, pp. 108, 109. 



