[14] Virchow’s Archiv. 114, 1888.
[15] Zeitschr. wiss. Zool. 53, 1891.
[16] Zeitschr. wiss. Zool. 55, 1892.
[17] In the pressure experiments I had altered the relative position of the nuclei in origine. In later years I succeeded in disturbing the arrangement of the fully formed cells of the eight-cell stage, and in getting normal larvæ in spite of that in many cases. But as this series of experiments is not free from certain complications—which in part will be understood later on (see page [73])—it must suffice here to have mentioned them. (For further information see my paper in Archiv. f. Entwickelungsmechanik, xiv., 1902, page 500.)
[18] Mitteil. Neapel. 11, 1893.
[19] But the elementary magnets would have to be bilateral!
[20] Arch. Entw. Mech. 2, 1895.
[21] Anat. Anz. 10, 1895.
[22] Arch. Entw. Mech. 3, 1896.
[23] It deserves notice in this connection, that in some cases the protoplasm of parts of a germ has been found to be more regulable in the earliest stages, when it is very fluid, than later, when it is more stiff.