IQ20] 



SHU LL— SEEDS 



373 



obtained by measuring the total increase in weight due to absorp- 

 tion for different periods of immersion. This equation takes the 

 form y = a \og 10 (bx + i) + c , in which y = the total percentage of 

 intake, and x = the length of time of immersion, a, b, and c being 

 constants. In the later work it was found that a still closer approxi- 

 mation could be obtained by the employment of two equations of 

 this form tangent to each other, the first equation representing the 



TABLE VII 



Algebraic curve for absorption data at 5 c; absorption 



in percentage of air-dry weight (Xanthium) 



Time 



Data low 



1 minute.. 

 15 minutes 

 30 minutes 

 45 minutes 

 60 minutes 

 75 minutes 

 90 minutes. 



105 minutes 



120 minutes. 



135 minutes. 



150 minutes. 



165 minutes. 



180 minutes. 



195 minutes. 



210 minutes. 



240 minutes . 



270 minutes. 



300 minutes. 



330 minutes. 



390 minutes. 



450 minutes. 



510 minutes. 



570 minutes. 

 18.5 hours. 



Computed 



Data high 



6.226 

 8.544 



15.710 



17. IOI 



I9.8IO* 

 20.9OO* 





27965 

 29.182 



33.159 



3S.072 

 36.486 



38.400 



45 • ° 2 ° 



1055 



3-739 

 6.279 



8.545 

 10.591 



12.456 

 14.169 



15753 

 17.226 



18.603 



19.896 



21. 113 



22.265 



23-3S6 



24 • 394 

 26.327 



28.098 



29.732 



3L247 



33-987 



36.410 



38.583 

 40.524 

 52975 



1. 124 



3-8i4 



10.747 

 12.521 

 14.202 • 



18.724 



22 



23 



24 

 26 



270 

 400* 



540* 

 701 



3I-304 



♦Data from series II. 



earlier data, the second representing the later data beyond the 

 point of tangency. In one case it was found advantageous to 



third 



with 



made to approximate 



is truly surprising. It has been applied to the data furnished by 

 Brown and Worley for barley seeds, and approximates their 



data more closely than the calculated values they obtained from 



their formula. 



upposed 



