480 



BOTANICAL GAZETTE 



[JUNE 



outer yellowish layer o (fig. 5) comes off. On using this as a mem- 

 brane the rate was now found to be 210.27 mg. per hour. This 

 indicates that the inner portion of the membrane is the one that 



TABLE VII 



Rate of absorption of water by seeds of Citrus grand is 



Time 



Coats on 



Weight in gm. 



Percentage of 

 water imbibed 



Coats off 



Weight in gm. 



Commencing. . 

 After 12 hours 



u 84 « 

 " 108 " 



144 

 " 204 " 



Oven dry 



2.423 

 2. 762 

 2.888 

 2.932 



2-942 



2.986 



3 056 



2.283 



6 

 20 

 26 

 28 

 28 



30 



33 



13 



9 



5 

 4 



9 

 8 



9 



2.087 



3-135 



3-233 



3-i7i 

 3-123 



3.129 



3-139 

 1. 971 



Percentage of 

 water imbibed 



5 

 58 



64 

 60 



54 

 58 



59 



67 



9 



3 

 8 



8 



7 

 2 



HOURS 



Fig. 6. — Showing rate of imbibition of water by seed of Citrus grandis; rate with 

 coats compared with rate without coats; curves obtained by plotting data given in 

 table VIII. 



offers the resistance to the passage of water, and it is believed that 



amount 



substances surrounded by thick pectinized walls. 



Results of chemical analysis 



An analysis was made of a quantity of the seed coats of Arachis 

 hypogaea. A complete analysis for all constituents of the mem- 

 brane was not attempted, but an examination was made only for 







