1920] 



SHULL— SEEDS 



377 



The point of equal tangency in these curves comes at £ = 22.91, 

 and at this point in curve 1, y = 19. 28409, while in curve 2, 

 y = 19 . 28407. The break therefore is only o . 00002 per cent. The 



■ 



agreement between computed and observed intake here is not 

 quite so close as in the 5 curve, but is still very good (see table X, 

 the data for which come from the final columns of tables IV and V) . 

 It is apparent in these later results, just as in the earlier ones, 

 that approaching saturation does not begin to interfere with 

 absorption rates until 35-40 per cent of intake has occurred. 

 It should be quite clear, also, that the equations employed run so 



TABLE X 



CURVES FOR ABSORPTION DATA; INTAKE 



weight (Xanthium) 



:ntage of air-dry 



Time 



(minutes) 



20' 



I 



5 

 10 



3o 



45 

 60 



75 

 90 



105 

 120 



*35 

 *5o 



165 



180 



Data low 



2.38 



7.92 



14.64 



23.64 





35- 20 

 36.66 



Computed 



2-39 



5-2Q 



8.05 



10.21 



14.86 



18.18 



21.09 



23.69 



26.04 



28. 19 



30.17 

 32.00 



Data high 



Time 

 (minutes) 





5-34 



10.32 



"l8 o : 4 

 21.13 



35 



Data low Computed 



33 



35 30 

 36.80 





32.18 

 33-72 



5 

 10 



15 

 20 



30 

 40 



50 

 60 



70 



80 



90 



100 



15. 11 

 17.84 



29.70 



35 

 38 

 40 



4i 



7i 

 13 



19 



78 



2.82 



7.46 

 11.78 



17.89 

 22.38 



26.29 



29.76 



32.90 



35-75 

 38.37 



40.79 

 43 °3 



Data high 

 2.83 



II.82 



22.45 

 26.32 



• • m m m 



32.95 



close to the observed data that the velocity of intake can be 



moment 



Instead of 



plotting curves and attempting to measure the tangents graphically, 

 they have been calculated from the known formula. 



The velocity of intake has been computed from the tangents 



on each temperature curve of intake. These points 



points 



WORLEY 



5> 7 -5. 10, 15, 20, and 25 per cent of intake. The percentage 



hourly 



points, on each curve shown in 



tables VII and VIII, together with the logarithms of the hourly 



intake, are shown in 



