Mutations in Other Families. 



299 



MUTANTS ARISING FROM THE CROSS O. LATA X O. NANELLA. 



1586 15 14 



Altogether, 31 mutants, or nearly 2 % 



MUTANTS ARISING FROM CROSSES WITH THE OLDER 



SPECIES. 



NATURE OF CROSS 



O. Lam. X O. bienfiis 

 O. Lam. X O. biennis 



O. Lam. X O. suaveolens 



O. lata X O. biennis 



O. lata X O. suaveolens 



That is, somewhat over 2 % of mutants. 



The mutability of all these crosses is thus shown to 

 be about the same as that of 0. Laniarckiana. 



I have, finally, tested the offspring of crosses in the 

 second generation If we select the seed of hybrids 

 which, to judge by their characters, belong to some one 

 of the new species, we get, by sowing it, proportions of 

 mutants which closely correspond with those given on 

 p. 297. But if we select the seed of self-fertilized hybrid 

 Lamarckianas we find, on the contrary, that they exhibit 

 the same dee^ree of mutabilitv as ordinary ones. 



