REJUVENESCENCE IN NATURE. 315 



the Laburnum with incised leaflets (Cytisus Laburnum 

 quercifolius}, as also in the more or less incised variety of 

 the Beech (Pagus sylvatica asplenifolid) in the Carlsruhe 

 Botanic Garden, the ordinary parent-form reappearing 

 with the perfectly marked variety, on isolated sprouts of 

 these plants. The same phenomenon has also been 

 observed in the Parsley Vine.* The strangest cases 

 belonging here are not those in which the modifications 

 are combined with the sprouts, as subordinate individuals 

 of the " stock," but those where the process of separation 

 of the varieties extends only to some limited part of the 

 organs, or even to single groups of cells, and perhaps 

 even to the individual cell, as exhibited by the pheno- 

 menon so frequently occurring among cultivated plants, 

 of plants with variegated leaves (e. g. in Cabbages,!) 

 divided irregularly into several colours, striped or dap- 

 pled flowers (in Tulips, Pinks, Roses) { and fruits (in 

 Gourds, Apples, Grapes, &c.) One of the most beau- 

 tiful examples of this kind is offered by Mirabilis 

 Jalappa. The three varieties, with deep-red, nankin- 

 yellow, and white flowers, are not unfrequently found 

 two or even all three united on the same " individual/' 

 in such a manner that there are stocks with the 

 flowers striped with: 1. red and yellow, 2. red and 

 white, 3. yellow and white, and 4. red, yellow, and 

 white ; and not unfrequently, also, isolated single-coloured 

 flowers present themselves on the same stock, these being 



Jacq.,) I have often seen isolated shoots bearing pure sulphur-yellow 

 flowers, (B. lutea, Mill.,) sometimes even flowers divided into the two 

 colours. 



* See Babo and Metzger, 1. c., p. 35, where the authors state that they 

 have detected, on vigorous stocks of this variety, isolated branches with 

 leaves which were merely five-parted and undistinguishable from the leaves 

 of the white Guledel. 



f Here belongs what is called ihefederfcohl, a variegated winter cabbage 

 (Brassica oleracea acephala,*) which represents a mixture of the green and red 

 cabbages, (Metzger, ' Kohlarten,' 20.) 



J The striped rose, frequent in gardens, is a Rosa gallica, with white, red- 

 striped flowers, on which sometimes occur half or even entirely red flowers. 



Thus in the two-coloured Morillon, (Morillon patiache.) See Babo and 

 Metzger, ' Wein. and Tafeltrauben,' 169, heft, ix, t. 4. 



