1912.] The Size of the Aorta in Warm-Blooded Animals. 49 



is 7T2 per cent., while if the area be calculated as a percentage of body 

 weight it is 7"22. If the value 072 be taken for n, k becomes 12 - 2. 



Table IX. — Ptarmigan (individuals;. 



6 



m 



Sex. 



Body weight. 



Radius of aortn. 



Area of aortic cross- 

 section. 



4 



% 



II 



8 4? 



^ -_ 



2? 



£ ? c 



£2 • 

 £ = 12 



a a -f 

 US S'g 



•< 



_Z: 



= 1: - 



§ " * 



in " 



Difference between 

 cross-section calcu- 

 lated and observed. 



- ^ 



Z ^ 

 r- at ~zl 



- 3 <3 



- — fe 



1 



D ° Jj 

 — X 

 = ,£3 



.£ = 



o "5 

 :- t - 

 ~ i - 



Z 5 ~ 

 i. i- - 



s . 



"— Z -i: 



i 



? 



grms. 

 470 



mm. 

 1 -58 



sq. mm. 

 7-8 



10 1 



1 -66 



6 92 



per cent. 

 12 71 



6 58 



per cent. 

 18 54 



2 



? 



470 



1 4 



6-19 



12 "8 



1 32 



6-92 



10 -53 



6 58 



5 93 



3 



? 



530 



1 -48 



6 84 



12 6 



1 29 



7-54 



9 28 



7-42 



7-82 



4 



¥ 



538 



1 -59 



7 93 



10 9 



1 47 



7 62 



4-06 



7 53 



5 31 



5 



? 



553 



1 -51 



7 19 



12 3 



1 3 



7-77 



7 46 



7-74 



7 11 



6 



? 



590 



1 63 



8 35 



11 -1 



1 42 



8 -14 



2 "58 



8 26 



10 



7 



? 



600 



1 -68 



8 91 



10 5 



1 49 



8 23 



8 26 



8-4 



6 07 



8 



? 



630 



1 65 



8 58 



11 3 



1 36 



8 52 



7 



8 82 



2 72 





? 



650 



1-75 



9 oS 



10 4 



147 



8 72 



9-87 



9 1 



5 27 



10 



? 



710 



1 67 



8-71 



12 1 



1 23 



9 24 



5 73 



9 94 



12 37 











11 4 



1-4 





7 12 





7-22 

















Table X. — Ptarmigan (grouped). 



Group. 



Numbers of individuals i 

 from Table IX in 

 group. 



A verage body weight. 



Average radius of aorta. 



eS 3 

 || 



© 1 



tc x 

 £ o 

 f 6 



|4 



O 



II 



CD i 



"— 



C - 



m 



1 8. 



o — "* 



< 



~'i in 



1*7 



!<« 



p 

 o 



Z "- -r 

 id « 

 — ~ r 



03 — 



X 



:- S 

 £ S - 



.- 1 g 

 3 g - 



= :i 

 P 



| to bt 

 - 3 Z 



| Z S 



« c-- 



T. V 5 

 i — — 

 a x -— . 



6 



- — ' 



5 - O 



-r 5 r 



,£ s 



OQ 



= 



o 



Ta 



- c = 



i " =3 



- I- 

 c ^ 



= t -= 



A 



1-2 



gran. 

 470 



mm. 

 1 49 



sq. mm. 

 6 69 



12 



1-49 



6 94 



per cent. 

 72 



6 63 



per cent. 

 5 43 



B 



3-4 



534 



1-53 



7 39 



12 5 



1 -38 



7 6 



2 76 



7 -53 



1 -86 



C 



5-7 



581 



1-61 



8-15 



12 



1 4 



8-08 



87 



8-19 



49 



D 



10-12 



663 



1-69 



8 96 



12 



135 



8-89 



78 



9 35 



4 -17 



r 







A vera ere 



12 1 



1 41 





1-28 





2 99 









— — 









In Table X the ptarmigan are arranged in four groups according to weight, 

 and the aortic constant and aortic percentage are calculated from the average 

 figures of these groups. In this case the best n is - 72, giving an average 

 value for k of 12*1. The variations in the aortic constant are small and non- 



V0L. LXXXVI. — B. E 



