THE REST-PERIOD OF SEEDS 



429 



FIGURES ILLUSTRATING THE GROWTH ON THE PLANT OF THE SEED 

 AND EMBRYO OF THE Ivy (HEDERA HELIX) FROM NOVEMBER 

 1908 TO JUNE 1909. 



November 9. 



Seed, 4 '5 mm. 

 Embryo, 07 ,, 



December 3. 



Seed, 5 '5 mm. 

 Embryo, i'6 ,, 



January 9 



Seed, 6 mm. 

 Embryo, z 'z mm. 



January 24. 



Seed, 7 mm. 

 Embryo, 275 mm. 



February 21. 



Seed, 67 mm. 

 Embryo, 2*5 ,, 



March 19. 



Seed, 6 '3 mm. 

 Embryo, 2*3 ,, 



April 20. 



May 1 6. 



Early in June. 



Seed, 6*3 mm. 

 Embryo, 4 mm. 



Seed, 6 mm. 

 Embryo, 6 ,, 



Germinating seeds. 



All enlarged ; in the case of the seeds twice the natural length, and in the case of the 

 separate embryos four times, but the germinating seeds are drawn about one and a half 

 times the normal length. 



With the exception of the germinating seeds, therefore, all the seeds are drawn to 

 one scale, and since the separate embryos are also drawn to one scale, it follows that the 

 changes in size are respectively in true proportion. 



These figures are intended to illustrate the results given in the preceding table. 



