156 



On the Reproductive Functional 



[No. 







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By calcu- 









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The 









Table 4. — Pure and Mixed Unions 

 of V. lyclmitis, lutea, L. as $ 



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comparative 

 fertility of 

 the different 







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unions. 







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No. 









1. 



V. lyclmitis, lutea, L. by own 





















pollen, 



6 



6 



226 



38 



20 



753 



1000 





2. 



V. lyclmitis lutea by pollen 





















of V. lyclmitis, alba, 



8 



7 



249 



36 



20 



711 





944.2 



q 



V. lyclmitis, lutea by pollen 





















of V. pliainiceum, L., 



5 



3 



75 



25 



20 



500 





664.0 



4. 



V. lyclmitis, lutea by pollen 

 of V. pliceniceum, L. var. 





















alba of gardens, 



5 



3 



63 



21 



20 



420 





557.7 



5. 



V. lyclmitis, lutea by pollen 

 pi V. pliceniceum, L. var. 





















alba of gardens, 



5 



2 



37 



18 



20 



370 





491.3 



6. 



V. lyclmitis, lutea by pollen 

 of V. blattaria, L. var. alba 





















of gardens, 



8 



4 



85 



21 



20 



425 





564.4 



7. 



V. lyclmitis, lutea by pollen 

















. 





of V. blattaria, lutea, L., 



8 



5 



97 



19 



20 



388 



,. 



515.2 



8. 



V. lyclmitis, lutea by pollen 

















. 





of V. thapsus, lutea, L., . . 



10 



7 



123 



18 



20 



351 





466.1 



9. 



V. lyclmitis, lutea by pollen 

 of V. tlia/psus, L. var. alba 





















of gardens, 



10 



5 



75 



15 



20 



300 





398.4 



10. 



V. lyclmitis, lutea by pollen 





















of V. nigrum, L., 



10 



6 



182 



30 



20 



607 



.. 



806.1 



11. 



V. lychnitis, lutea by pollen 





















of V. vwgaUim, With., 



10 



5 



111 



22 



20 



444 



,. 



589.6 



12. 



V. lyclmitis, lutea by pollen 

















. 





of V. tliapsiforme, Schrad, . 



8 



3 



52 



17 



20 



347 





460.8 



In Table 3 we have first the results of the pure unions of V. 

 lychnitis, alba, and by comparing them with those resulting from fer- 

 tilisation with the pollen of V. lychnitis, lutea, we find that the latter 

 cross-unions undergo the proportionately decreased fertility of 100 : 82. 

 By the hybrid-unions of V. lychnitis, alba, with the pollen of V. 

 fhceniceum, alba, a slightly higher degree of sterilisation results ; the 

 proportion in this case being as 82 : 67, relatively to 100 produced 

 by the pure unions of V. lychnitis, alba. The highest degree of 

 sterilisation in this Table results from the union of V. lychnitis, 

 alba, by pollen of V. thapsus, alba, the proportion of the pure to 

 the hybrid unions being here as 100 : 47. 



