THE SHRINKING AND SWELLING SEED 213 



by the loss of weight of the materials when exposed in the 

 oven to a temperature of about 100° C. We should expect 

 to find with all three types of seeds, where the swelling ratios 

 for the coats are not far apart, that the water-percentages for 

 the seed-coverings would not differ much in amount. We 

 would also expect in the case of the kernels that where the 

 swelling ratio is greatest, as with impermeable seeds, the 

 water-percentage would be lowest ; that where the ratio is 

 smallest, as with permeable seeds, the water-percentage 

 would be largest ; and that where it is intermediate in value, 

 as with variable seeds, the water-percentage would be also 

 intermediate in amount. These indeed are the actual 

 results that are represented in the tabulated summary to 

 be now given as respecting seeds for which all the requisite 

 data have been obtained. In order to avoid disturbing 

 influences, the summary is restricted entirely to leguminous 

 seeds, not to all leguminous seeds, but to exalbuminous 

 seeds of that order. 



Tabulated Summary of Results showing the Average Relation 



BETWEEN the SWELLING RaTIOS OF THE COATS AND KERNELS OF 



Permeable, Variable, and Impermeable Seeds and the Water- 

 percentages. 



(The swelling ratios are given in the general table in this chapter, and the water- 

 percentages in the table illustrating the absorptive capacities of seeds in Chapter VI.) 



The Permeable seeds are Canavalia ensiformis, Pisum sativum, Faba vulgaris, 

 and Phaseolus niultijiorus. 



The Variable seeds are Abrtis precatorius, Ccesalpinia Sappan, Erythrina 

 corallodendron, and E. indica. 



The Impermeable seeds are Adenanthera pavonina, Dioclea rejlexa, Entada scandens, 

 Guilandina bonducella, G. bonduc, and Mucuna urens. 



