Elementary botany . minant character in the second generation, one-third (or 25% of thewhole number) are pure dominants if self-fertilization is continued, while50% are really cross breds like the first generation, and if self-fertilizedsplit up again into approximately 25 dominants, 50 cross breds, and 25recessives. This is what is called Mendels law. Where the original par-ents differ in respect to more than one character, the result is more compli-cated (see Mendels Principles of Heredity; also de Vries, Das Spaltungs-gesetz der Bastarde, Per. d. deutsch. bot. Gesell., 18, 83, 1900). 674c.
Elementary botany . minant character in the second generation, one-third (or 25% of thewhole number) are pure dominants if self-fertilization is continued, while50% are really cross breds like the first generation, and if self-fertilizedsplit up again into approximately 25 dominants, 50 cross breds, and 25recessives. This is what is called Mendels law. Where the original par-ents differ in respect to more than one character, the result is more compli-cated (see Mendels Principles of Heredity; also de Vries, Das Spaltungs-gesetz der Bastarde, Per. d. deutsch. bot. Gesell., 18, 83, 1900). 674c. Mutation.—This term is applied to those variations which appearso suddenly that some of the progeny of two like individuals differ from allthe others to a marked degree. Some of these mutations are so differentas to be regarded as new species. Some of the primroses show mutations,and (Enothera gigas is a mutation from Oenothera lamarkiana (see de Vries,Die Mutationstheorie, Leipzig) GAMETOPHYTE AND SPOROPHYTE. 339. CHAPTER XXXVII. MORPHOLOGY OF THE NUCLEUS AND SIGNIFI-CANCE OF GAMETOPHYTE AND SPOROPHYTE. 676. In the development of the spores of the liverworts,mosses, ferns, and their allies, as well as in the development ofthe microspores of the gymnosperms and angiosperms, we have observed that four spores are formedfrom a single mother cell. These
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