GOO JOUENAL OF THE ROYAL HORTICULTURAL SOCIETY, 



narrower leaves. In addition, the edges of their leaves are usually 

 curled, and the leaves forming the heart are whitish and incurved so 

 as to completely enclose it. Moreover, the double forms possess more 

 distinctly hairy fohage than the single forms. It is said that M. Chat6 

 first tabulated these differences. He also tells us * that the Erfurt 

 growers claim to be able to foretell which plants will be double from 

 the abnormal shape of the seeds of the parent. 



(7) In the Amaryllese solid peduncles are associated with light 

 coloured,! bulbous seeds in seventeen genera, whereas hollow peduncles 

 are associated with black seeds, generally I flat or nearly so in twelve 

 genera. 



Out of the thirty genera which I have examined, twenty-nine adhere 

 to this rule of association. § The only exception in the genus Pan- 

 cratium, which is characterized by a solid peduncle in conjunction with 

 black, bulbous seeds. Perhaps some other exceptions may exist in 

 genera which are rarely grown or seeded under cultivation. 



Instances of Linked Characters. 

 [Drawn from other sources.] 



Hugo de Vries, in his book Plant Breeding; gives a number of 

 instances of correlation of characters. 



Mr. Sutton || showed garden forms of Primula sinensis in which all 

 the individuals with markedly frilled edges to the leaves had also frilled 

 edges to their petals. Some may say this is only one character dupli- 

 cated in two parts of the plant. But all characters which cannot be 

 dissociated are in truth one. 



❖ ^ ❖ 



The association of characters dependent upon sex was one of the 

 subjects treated by Darwin, and upon which he threw a flood of light. 

 He showed us how it is possible to account, in some cases, for the 

 constant association of secondary with primary sexual characters. In 

 other cases, although the necessity for this association is undoubted, 

 the reason for it was not known to him. Now if sex determines the 

 association of characters in unisexual organisms, it is possible that the 

 function of reproduction in those organisms which possess alternative 

 or auxiliary modes of reproduction may also determine the association 

 of characters. 



For instance, the Amaryllidese generally possess three modes of 

 reproduction: (1) by sexual union productive of seeds, (2) by a par- 



*See (1) Vegetable Teratology, Dr. M. T. Masters, 1869, Kay Soc. ; also 

 (2) Gard. Chron., 1886, p. 74; and (3) Tra'di des Giro fifes, E. Chate. 



t Pearly or flesh-coloured in six genera; green in nine genera; yellow in tv/o 

 genera. 



+ Flat in eight genera ; bulbous in foui' genera. 



§ The association of Leucojum and Acis in one genus appears faulty. 

 II Royal Horticultural Society Scientific Committee. 



