230 Prof. J. B, Farmer. On the Quantitative Differences in the 



Table VI. — Twenty-three Branches of Privet. 



1 



Age in years. 



Absolute vol. in c.c. 

 per hour. 



Specific vol. in c.c. 

 per i hour. 



1 



6 



37 '5 



1 



7 "4 



35 5 



1 



7 -2 



34*5 



1 



5 '2 



35 -5 



1 



6 '4 



39 -0 



1 



6 "5 



34 "5 



1 



6 -2 



41 -5 



1 



6 -3 



29 -2 



2 



9 "0 



31 '0 



2 



8 '0 



40 "0 



1 



7 -6 



37 -5 



1 



7 -6 



39 -0 



2 



11-4 



33-5 



2 



7-6 



42 -0 



2 



14-8 



37 -0 



4 



14 -6 



32 -0 



2 



14-6 



40-5 



2 



4-0 



32 -5 



4 



8-0 



27 -5 



2 



11 -2 



37 -5 



2 



16 -2 



38 -0 



2 



9-4 



37 -5 



2 



15-0 



34 -0 



Total 



826 -7 

 = 35 -9 



with a few outliers on either side, but a large proportion falling close to the 

 mean, 37-3, with a P.E. of 3-6 for the whole lot. 



The curve is a very regular one, but not more so than that furnished by 



20 25 30 35 40 AS 50 55 



Fig. 2. — Eesults for Privet. Arithmetic mean = 37'3 and the P.E. = 3-6. 



