484 On the Latent Capacity for Mutation. 



The stigmas behave in exactly the same way: 



6 Ns 7 Ne 5 Ns 1 Nu Total, 19 flowers. 



This curve would have to be reduced in the same 

 manner. An increased number of stigmas (or of the 

 divisions of the stigmas) is however so common in ordi- 

 nary tetramerous flowers that the above cases are insig- 

 nificant compared with them. Flowers with 5-8 stigmas 

 are common ; and as a rule all or most of the flowers on 

 a single plant have these high numbers ; but I very rarely 

 found flowers with 9, 10 and 11 stigmas. The variation 

 in the number of stigmas is therefore also describable by 

 a half Galton-curve. 



Fig. log. Oenothera Lamarckiana. Pitcher formation on a 

 fasciated plant, 1892. The pitcher is inserted close to 

 the base of the lower leaf; but more than half of its 

 stalk is fused to the main stem. 



The tendency of the parts of the flower to polymery 

 has therefore been latent in Oenothera Lamarckiana and 

 in the various families during the whole period of my 

 investigations. 



Some Rarer Partial Deviations on Vegetative Parts. 



Leaves with two apices and split median veins oc- 

 curred in 1887 and 1888 on the field at Hilversum, in 

 1887 in a tricotylous O. lata, in 1892 in a tricotylous 0. 

 laevifolia, and repeatedly since in the various cultures. 



