[78] Morgan, T. H., Jour. Exper. Zoöl., 1904, i., 135; Arch. f. Entwcklngsmech., 1910, xxx., 206.

[79] Fuchs, H. M., Jour. Genet., 1915, iv., 215.

[80] Quoted from Fuchs.

[81] Correns, C., Biol. Centralbl., 1913, xxxiii., 389.

[82] Pfeffer, Untersuchungen aus dem botanischen Institut zu Tübingen, 1881–1885, i., 363.

[83] Bruchmann, H., Flora, 1909, ic., 193.

[84] The substitu­tion of well-known physico­chemical agencies for the mysterious action of the spermato­zoön was the task the writer set himself in this work and not the explana­tion of natural parthenogenesis, as the author of a recent text-book seems to assume.

[85] Loeb, J., Am. Jour. Physiol., 1899, iii., 135; 1900, iii., 434.

[86] Loeb, J., Artificial Parthenogenesis and Fertiliza­tion, Chicago, 1913. The reader is referred to this book for the literature on the subject.

[87] The reader will find a descrip­tion of the development of this egg in the next chapter.