Contents xv 



LECTURE PAGE 



erum Mephisto Danebrog. Mendel's laws. 

 Unit-characters. 



D. EVERSPOBTING VARIETIES. 



XI. Striped flowers 309 



Antirrhinum majus luteum rubro-striatum 

 with pedigree. Striped flowers, fruits 

 and radishes. Double stocks. 

 XII. "Five leaved" clover .340 



Origin of this variety. Periodicity of the 



anomaly. Pedigree-cultures. Ascidia. 

 XTTT. Polycephalic poppies 369 



Permanency and high variability. Sensi- 

 tive period of the anomaly. Depend- 

 ency on external conditions. 

 XIV. Monstrosities 400 , 



Inheritance of monstrosities. Half-races 

 and middle races. Hereditary value of 

 atavists. Twisted stems and fascia- 

 tions. Middle races of triocotyls and 

 syncotyls. Selection by the hereditary 

 percentage among the offspring. 

 XV. Double adaptations ...... 430 



Analogy between double adaptations and 

 anomalous middle races. Polygonum 

 amphibium. Alpine plants. Othonna 

 crassifolia. Leaves in sunshine and 

 shadow. Giants and dwarfs. Figs and 

 ivy. Leaves of seedlings. 



E. MUTATIONS. 



XVI. Origin of the peloric toad-flax ... 459 

 Sudden and frequent origin in the wild 

 state. Origin in the experiment-garden. 

 Law of repeated mutations. Probable 

 origin of other pelories. 



