Tissue Weight and Water Content. 



209 



concerning the physiological differentiation of the two races to 

 be drawn from the average weights per plant. 



The differences in the average percentage of dry substance 

 vary considerably but it is impossible to state in the absence of 

 probable errors that the ratio differs from class to class. 



The foregoing results for a heritable abnormal race substan- 

 tiate the conclusions concerning the association of physiological 

 with morphological differences already drawn from a comparison 

 of variant and normal individuals within the same race. 



Number of 

 Lcavcf of 

 Abnormal Race. 



Pair* 



of 

 Plants. 



Value per Plant. 



Value per Leaf. 



Per cent. 

 Substance. 



Mean 

 Green 

 Weight. 



Mean 

 Dry 

 Weight. 



Mean 

 Green 

 Weight. 



Mean 

 Dry 

 Weight. 



2 Leaves 

















196 



.52390 



.03790 



.26195 



.01900 



7.309O 





196 



.76285 



.05645 



.38145 



.02825 



7-4350 







— •23895 



— .01855 



— .11950 



— .OO925 



— .1260 



Percentage difference . . . 





-3155 



-32.55 



-31-55 



-32.40 





3 Leaves 

















500 



.61086 



.04174 



.20360 



.01392 



6.8516 



Control 



500 



.77094 



.05606 



.38550 



.02806 



7.2842 



Difference 





— .16008 



— .01432 



— .I819O 



— .OI414 



— .4326 



Percentage difference. . . 





-20.74 



-25.54 



-47.16 



-50.38 





4 Leaves 

















700 



.68947 



.04587 



.17238 



.OII47 



6.6918 





700 



.78631 



.05501 



.39318 



.02751 



7.0305 







— .09684 



— .00914 



— .22080 



— .OI604 



-.3387 



Percentage difference. . . 





-II.97 



-16.34 



-55 95 



-58.12 





5 Leaves 

















500 



.70542 



.04740 



.14108 



.OO948 



6.7618 





500 



.77152 



•05504 



.38580 



.02754 



7.1692 







— .06610 



— .00764 



-.24472 



— .01806 



-.4074 



Percentage difference. . . 





-8.60 



-13-78 



-63.46 



-65.52 



6 Leaves 

















300 



.74746 



.05146 



.12456 



.00860 



6.9076 





300 



.77206 



.05596 



.38603 



.02796 



7.2616 







— .02460 



— .00446 



— .26146 



-.OI936 



-•3540 



Percentage difference. . . 





-3-10 



-7-93 



-67.66 



— 69.16 



7 Leaves 

















138 



.73120 



.05570 



.IO45O 



.00800 



7.6200 





138 



.77850 



.06140 



•38930 



.03070 



7.8920 



Difference 





-.04730 



-.00570 



— .28480 



—.02270 



— .2720 



Percentage difference. . . 





—6.00 



-16.76 



-73-io 



-73-90 





