DISTRIBUTION OF ACTIVITY 



13 



natural lifetime. In this experiment the vegetarians seem to have done 

 their best day's work when about one-fourth of their life had passed. This 

 was equivalent to about one-sixth of the lifetime of the normal omni- 

 vorous rat. 



Let us now consider the total amount of work, as indicated by the 



.S 



<u 

 bo 



< 



I 

 2 

 3 



4 

 5 

 6 



7 

 8 



9 



ID 

 II 

 12 

 13 

 14 

 15 

 16 



17 

 18 



19 

 20 



21 



22 



23 

 24 



25 

 26 



27 

 28 

 29 



30 

 31 

 32 



33 

 34 



OMNIVOROUS EXERCISED RATS 



Male 



No. I 



1,200 

 18,850 



79,750 



148,460 



248,990 



329,900 



403,070 



487,130 



576,360 



722,880 



817,000 



883,120 



961,360 



1,068,300 



1,165,990 



1,206,980 



1,271,700 



1,309,080 



1,339,080 



1,382,130 



1,400,500 



1,429,570 



1,457,500 



1,469,340 



1,486,250 



Male 



No. 2 



3,050 

 26,140 



91,130 



189,620 



322,420 



438,020 



523,320 



650,490 



786,660 



982,210 



1,082,000 



1,215,190 



1,378,680 



1,548,570 

 1,666,150 

 1,760,900 

 1,849,340 

 1,975,140 

 2,072,520 

 2,146,720 

 2,203,380 

 2,277,120 

 2,334,160 

 2,380,260 

 2,423,250 

 2,447,180 

 2,456,190 

 2,460,110 

 2,462,520 

 2,463,950 

 2,464,770 

 2,465,130 



Female 



No. 3 



1,300 

 23,010 

 111,320 

 201,730 

 406,780 

 672,070 

 1,041,330 

 1,388,260 

 1,678,890 

 2,028,190 

 2,332,260 

 2,647,640 

 2,938,160 

 3,286,540 

 3,559,830 

 3,820,590 

 4,091,400 

 4,318,780 

 4,599,500 

 4,867,910 

 5,076,100 

 5,290,770 

 5,462,560 

 5,573,480 

 5,679,360 

 5,796,630 

 5,909,860 

 6,018,140 

 6,118,320 

 6,202,570 

 6,259,910 

 6,353,920 

 6,414,900 

 6,427,500 



Male 



No. 4 



2,060 



23,390 



118,150 



248,780 



409,250 



508,500 



656,470 



777,640 



870,400 



952,860 



1,039,650 



1,104,240 



1,218,620 



1,399,100 



1,389,440 



1,455,930 

 1,488,930 

 1,529,400 

 1,571,080 

 1,588,710 

 1,601,920 

 1,613,700 

 1,624,420 

 1,631,780 

 1,639,060 

 1,642,100 

 1,642,580 



VEGETARIAN EXERCISED RATS 



Male 



No. 5 



2,040 



37,120 

 143,380 

 198,980 

 249,600 

 276,960 

 314,520 

 350,550 

 382,320 

 407,150 



437,090 

 467,380 

 492,170 

 505,820 

 511,340 

 515,530 

 520,910 

 523,000 

 525,890 

 527,520 

 529,160 

 530,560 

 533,000 



Female Female 



No. 6 



1,180 



26,620 



59,680 



82,070 



98,350 



111,670 



132,580 



158,890 



187,910 



210,720 



224,790 



238,750 



244,370 



No. 7 



760 

 22,550 

 76,840 

 133,430 

 180,070 

 238,550 

 290,780 

 374,400 

 450,980 

 555,180 

 581,180 

 604,830 

 634,340 

 651,680 

 686,590 

 704,900 



Female 



No. 8 



2,810 

 49,120 



149,330 

 238,940 

 285,940 

 364,240 



406,700 



483,720 

 575,160 

 659,590 



694,980 



723,820 

 749,280 

 772,930 

 784,740 

 787,450 

 790,040 



792,390 

 793,620 



794,930 

 796,360 



797,570 

 799,040 



Table III. — Comparative number of revolutions made by the omnivorous 

 and vegetarian rats at the ages indicated. The number of revolutions represents 

 the amount of voluntary running or work of each rat. 



