234 Non-Isolable Races. 



of the ordinary crimson clover and sowed part of it on a 

 bed of about five square meters. Two of the seedhngs 

 were tricotylous and one was tetracotylous, and these 

 were transplanted to a special bed as soon as possible 

 in the hope that tWey would exhibit the desired abnor- 

 mality. This hope was based on the principle of the 

 correlation between different kinds of anomalies.^ If a 

 plant exhibits an anomaly in its early stages it will, ac- 

 cording to this principle, be more likely than any other 

 individual in the same culture to give rise to other devia- 

 tions later on. In this particular case my expectation 

 was fulfilled, for the tetracotylous plant produced one 

 4-foliate and one 5-foliate leaf in the course of the sum- 

 mer. Such were not found on any other plant, either 

 during the course of the experiment or at the end of 

 July when the plants were in full bloom and were pulled 

 up and minutely examined. There wxre about a thousand 

 plants. 



I left the three selected specimens to flower together 

 and sowed their seeds in April 1896. Over 600 seedlings 

 came up, all of them with only two cotyledons. In all 

 of them the first leaf was single, which is the general 

 rule in clovers (Fig. 47 A). The second and third leaves 

 developed in May; they were quite normally trifoliate, 

 with tlie exception of one, of which one of the three 

 leaflets was split laterally, although not completely di- 

 vided. The form of this blade was similar to that figured 

 in Fig. 45 B. About 250 individuals of the whole group 

 were planted out. The seed had been sown in pans ; the 

 young plants were transplanted into pots and were planted 

 in the beds ir the middle of May. At the end of June, 



^ Eine Methode, Zwangsdrehungen aufzusuchcn, Ber. d. d. bot. 

 Ges., Vol. XII, 1894, p. 25. 



