514 Mutations 



view, as they are divergent in other respects. 

 It would be superfluous to dwell any longer 

 upon the difference between heads and flowers. 

 But it is as well to point out, that the term dou- 

 ble flowers indicates a motley assemblage of dif- 

 ferent phenomena. The hen-and-chicken daisy, 

 and the corresponding variety of the garden- 

 cineraria {Cineraria cruenta), are extremes on 

 one side. The hen-and-chicken type occurs 

 even in other families and is known to produce 

 most curious anomalies, as with Scahiosa, the 

 supernumerary heads of which may be pro- 

 duced on long stalks and become branched 

 themselves in the same manner. 



Petalody of the stamens is well known to be 

 the ordinary type of doubling. But it is often 

 accompanied by a multiplication of the organs, 

 both of the altered stamens and of the petals 

 themselves. This proliferation may consist in 

 median or in lateral cleavages, and in both 

 cases the process may be repeated one or more 

 times. It would be quite superfluous to give 

 more details, which may be gathered from any 

 morphologic treatise on double flowers. But 

 from the physiologic point of view all these 

 cases are to be considered as one large group, 

 complying with previously given definitions of 

 the ever-sporting varieties. They are very va- 

 riable and wholly permanent. Obviously this 



