44 Messrs. Dreyer, Ray, and Walker. [Sept. 30, 



Table III. — Eats (individuals). 



d 



Sex. 



Body weight. 



Radius of aorta. 



Area of aortic cross- 

 section. 



-4 



% 



II 



*a 



Aortic cross-section as 

 percentage of body- 

 weight. 



t3 



<a 



S3 



g«T OS 

 O r C\] 

 o II 11 



CO ' 



0Q 



O 



6 



Difference between 

 cross-section calcu- 

 lated and observed. 



Cross-section calculated 

 as percentage (1 "27) 

 of body weight. 



Difference between 

 cross-section calcu- 

 lated and observed. 







grm. 



mm. 



sq. mm. 









per cent. 





per cent. 



JL 



? 



30-1 



0-436 



0-597 



1 ft •'7R 



1-98 



u ozo 



13 -72 



0-382 



56-28 



o 

 2j 



? 



39 -1 



0-417 



-546 



24 '74 



1 -4 





13 -61 



-497 



9 -84 



Q 

 O 



S 



40 -3 



0-468 



0-681 



20 "08 



1-7 





6-35 



-512 



34 -18 



'± 



<? 



47 -2 



0-455 



0-657 



93 *71 



1 -38 



O •'799 



9-83 



0-599 



8 68 



o 



? 



53-0 



-493 



0-764 



91 -Qd. 



1 -44 



U / Ci 



2 -56 



0-673 



13 -52 



D 



<? 



56 -0 



-510 



-815 



21 "38 



1 -46 



n -fti ft 



-12 



-711 



14 63 



h 

 1 



¥ 



57 -7 



-548 



-941 



1 Q -Q9 



1 -63 





12-97 



0-733 



28 -37 



Q 



o 



¥ 



69 -7 



-566 



1-01 



9H • 1 ft 



1 -45 



u yoo 



5 -98 



0-885 



14 -12 



Q 



? 



75 -5 



0-599 



1-12 



1 Q .93 



1 "48 



i *m 



1 '09 



\J Via 



16 79 





9 



79 -5 



0-580 



1 -06 



91 *fiQ 



1 -31 



i -n^ 



i L/O 



0-95 



1 01 



4-95 



XJ. 



(? 



84-5 



0-669 



1 -4 



1 fi •R'7 



1 -66 



1 HQ 



JL Ui7 



28-44 



1-07 



30 -84 



1 9 



$ 



96 -7 



0-484 



0-735 



3d. 'Q3 



0-76 



JL lu 



38 -8 



1-23 



40 24 





$ 



104-0 



0-643 



1-3 



9n -Ri 



1 -25 



1 •9T 

 JL £i 



2 36 



1 -32 



1 -52 





S 



108 -0 



0-77 



1 -86 



1 J. -Q4. 



1 -72 



JL o 



40-38 



1 -37 



35 -77 



JLD 



S 



140-0 



0-669 



1 -4 



93 'ft^ 



1 -o 



JL OO 



10-26 



1-78 



21 35 



16 



$ 



141 -0 



0-707 



1-57 



21 -38 



1 -11 



1-57 







1 -79 



12-29 



17 



s 



141 -0 



0-669 



1 -4 



23 -97 



0-99 



1 -57 



10 -83 



1 -79 



21 -79 



18 



? 



141 -0 



0-678 



1 -44 



23 -31 



1 -02 



1-57 



8-28 



1-79 



19 -55 



19 



$ 



157 -0 



0-723 



1 "64 



22 -09 



1 -04 



1 -69 



2-96 



1 -99 



17 -59 



20 



s 



157 -6 



0-77 



1 -86 



19 -54 



1 -18 



1-7 



9 -41 



2-0 



7-0 



21 



<? 



160 -0 



0-819 



2-1 



17 -47 



1 31 



1 -72 



22 -09 



2 03 



3 -45 



22 



s 



164 -0 



-723 



1 -64 



23 -32 



1-0 



1-75 



6-29 



2 -08 



21-15 



23 



$ 



172 -0 



-812 



2 -07 



18-67 



1 -20 



1 -81 



14 -36 



2 -18 



5 05 



24 



s 



175 -0 



-732 



1 -68 



23 -29 



0-96 



1 -83 



8-2 



2 -22 



24 -32 



25 





179 -0 



"755 



1-79 



22 -22 



1 -o 



1-86 



3-76 



2-27 



21-15 



26 



s 



289 -0 



0-885 



2-47 



22 -62 



0-85 



2 61 



5 36 



3^67 



32 -7 



27 



$ 



303 -0 



1 -01 



3 -22 



17 -95 



1 -06 



2-7 



17-78 



3 -85 



16 36 





21 -37 



1-27 





11 -09 





19 -72 



In Table IV the rats are arranged in six groups according to weight, 

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

 figures of these groups. As in the case of the grouped guinea-pigs, the best n 

 is - 72, giving an average h of 21 - 9. It will be observed that in these grouped 

 animals the variations in the aortic constants of the groups are very small 

 and are non-periodic, while the aortic percentage falls markedly and very 

 regularly from 1-67 to - 96. Using the values just stated for n and k, the 

 average deviation between the calculated and the observed figures for the 

 aortic cross-section is only T18 per cent., while it is 16 - 22 per cent, (nearly 

 14 times as large) if the area be calculated in per cent, of body weight. 



