﻿406 



Dr. Norman Campbell on 



of z, and used only the larger values to determine N and V. 

 The discrepancy is not nearly so marked it' Q is taken as 

 eqnal to (3 and not to a, but the same procedure has been 

 adopted ; only values of Qjp to the left of the asterisk have 

 been used in computing the values of N and V. 



At the head of each table are given the values o£ N and 

 V deduced respectively on the assumption that Q = « and 

 that Q--/3. The first row of the table gives the value of z ; 

 the second those of Q//>, the exponential coefficient given by 

 the observations ; the third and fourth rows give the dif- 

 ferences between this observed value and the values of a 

 and f3 respectively calculated from the appropriate values 

 of N and V. 



It may be noted that the comparison effected in the last 

 two rows is rather more favourable to equation (5) than to 

 (13'), for the greater complexity of the latter has made it 

 necessary to adjust to a minimum the sum of the squares of 

 the residuals of (18), and not 1(Q/p — /3 {j y. whereas Town- 

 send's figures are adjusted so that 1(Q/p — a ) 2 is a 

 minimum. 



Table I. 

 Air. 

 (Q=«) N = 14-6, V' = 250. 

 (Q^/3) N =l7-93, V'^19-00. 



z 1000 800 700 600 500 4C0 300 



Q/p 10-5 9-3 8-7 7'9 7*0 582 44 



Q/p-acalf. ... +0+ Q'O +01 00 0-0 0'03 +01 



Q- /Scale +0'04 -0'OS +0-01 -001 -007 +002 +0-03 



200 100 



26 0-72 



+ 0-26 +0-34 



+ 0-04 +018 



Table II, 



Nitrogen. 



(Q*a) N = 12-4, Y / = 276. 



(Q = £) N '«il6'70, V'=21'30. 



z 



600 



500 



400 



Q/p 



71) 



6-2 



5-2 



Q/p—a calc. ... 



00 



- 025 



-01 



Q/p-/3calc. ... 



-016 



-0-08 



o-o 



300 200 100 



395 2-3 -42 



00 +0-06 +001 



0-07 -+0-06 -0-15 



