ADDITIONAL EVIDENCE 125 



Cardiospermum grandiflorum 



Chrysophyllutn Cainito (Star Apple) 



Citrus decumana (Shaddock) 



Dolichos Lablab 



Faba vulgaris (Broad Bean) 



Hura crepitans (Sand-box Tree) 



Lufta acutangula (Loofah) 



Phaseolus multiflorus (Scarlet-runner) 



Pisum sativum (Pea) 



Ricinus communis (Castor-oil) 



Of the thirteen genera here named five are leguminous and 

 the rest belong to a variety of other families. This list is 

 simply intended to illustrate the subject. A number of 

 additional examples might have been given ; whilst others, 

 like the seeds of the Horse-chestnut (yEsculus Hippocastanum) 

 and of Acorns (Quenus), will be more fittingly dealt with in 

 discussing the drying process of permeable seeds. In this 

 connection it should be observed that this matter has only been 

 handled here in so far as it brings out the contrast in behaviour 

 between permeable and impermeable seeds when deprived of 

 their coverings. 



The ultra-dryness of impermeable seeds as compared with Additional 



permeable seeds which has been disclosed by the various the^^wsock- 



experiments above discussed is. confirmed by the evidence tionofthe 



. . ^ ultra-dryness 



supplied when the seeds of the different types are exposed to of imperme- 



a temperature of 100° C. In other words, it is associated with with ^a tow 

 a low water-percentage. This was established for the seeds of ^^^^^' 

 Guilandina bonducella in Chapter IV. Here I will illustrate it 

 by a number of fresh examples and will discuss the subject, 

 therefore, from a more general standpoint. For this purpose 

 all my results for the three types of seeds are given in the ' 

 table in a later page of this chapter. 



There is but little significance in this feature of impermeable 

 seeds until it comes to be contrasted with the behaviour of 

 permeable seeds ; and even then the contrast must be made 

 with discretion. For instance, if we were to compare imper- 

 meable leguminous seeds indiscriminately with permeable seeds 



