HYGROSCOPICITY 



161 



the Shaddock was 1*6 per cent. But these do not represent 

 the maximum hygroscopic ranges. The Shaddock seeds in 

 another experiment in England gave a range of 2 per cent. ; 

 and probably the swing of the range, including ordinary extremes, 

 would amount to nearly 3 per cent, for all the permeable seeds 

 here experimented on. The last two are typically impermeable, 

 and the small variation exhibited is probably instrumental. 



DIAGRAM CONTRASTING THE BEHAVIOUR OF PERMEABLE AND IMPERME- 

 ABLE SEEDS AS RESPECTS THEIR VARIATION IN WEIGHT DURING 

 TEN DAYS OF CHANGEABLE WEATHER IN JAMAICA, THE RAIN 

 BEING INDICATED BY BLACK. 



(For further explanation see the preceding remarks. The three first-named are per- 

 meable and the last two are impermeable.) 



Anona palustrii 



Anona muricata . 



Citrui decumana . 



Entada scandens . 



Adenanthera pavontna . 



997-3-1010-4= 13-1 



997-4- 1009-3= I r-g 



looo-o 1016-1 = 1 6- 1 



i ooo-o i ooo- 1 = o- 1 



lOOO'O IOOO-I= O-2 



In course of time, however, I discovered that although 

 the method described and illustrated in the previous pages The method 

 exhibited the ordinary hygroscopic response of the permeable adopted of 

 seed to the usual weather changes within a limited period, J^^"""^ 

 it did not give me the whole range of the variation, such as scopic range. 



ii 



