60 



ROYAL HORTICULTURAL SOCIETY. 



S.Lapponum. silesiaca. purpurea, viminalis. caprca. caprca. daphnoides. daphnoidcs. 



AAAAAAA A 



T ^ T T" 



«□ O □> O 



□ o 



His notation to exhibit the whole history of the hybrid is ex- 

 pressed thus, $ indicating female, g male, spont. spontaneous, 

 art. artificial 



$ (Zapponum + silesiaca) spont. + 6 (purpurea + vimi- 



nalis) spont. 

 + (0* %caprea + S daphnoides) art.), 



which, expressed at length, denotes that the senary hybrid was 

 raised between a female parent derived from the intercrossing of 

 two spontaneous hybrids, of which the female parent was derived 

 from 8. Lapponum and silesiaca, and the male from 8. purpurea 

 and viminalis ; while the male parent was derived from an arti- 

 ficial cross of 8. caprea impregnated with the pollen of 8. daph- 

 noides. In the names of artificial hybrids, the female parent 

 always comes first, while in spontaneous hybrids the parents are 

 placed in alphabetical order. 



A complete list of the author's experiments follows, giving in 

 one column an account of those which proved successful, and in 

 another those which did not succeed, with the date of the ex- 

 periments. The former, comprising binary, ternary, quaternary, 

 quinary, and senary hybrids, amount to thirty-five ; the unsuccess- 

 ful, amounting to eighty-one, include the three first heads ; no 

 unsuccessful experiments were made in the fifth and sixth ; but 

 an attempt to obtain an octonary with two quaternary hybrids did 

 not succeed. Both lists are well worth the study of every one 

 engaged in the scientific determination of willows. The propor- 

 tion of successful experiments is far more unfavourable in binary 

 than in more complicated combinations. Nothing, however, can 

 be concluded from this ; for in binary hybrids an endeavour was 

 made to effect heterogeneous combination, or certain unions 

 already existing in free nature, and that with old pollen, while in 



