258 Wilson.— On Glands of Plumb agineae . 
Fig. 48. Cap-cells of a mucilage-gland from the above seedling arranged with 
noteworthy regularity. 
Fig. 49. A germinating seedling of the same species, nat. size. 
Fig* 5 °* Developing mucilage -glands in this seedling (Fig. 49). The smaller 
gland -05 mm., the larger -n mm. in diameter. 
Fig. 51. Abnormal seedling of the same species. Nat. size. 
Fig. 52. Cap-cells of a young mucilage-gland -2 mm. in diameter, after treat- 
ment with solution of caustic potash. 
Fig. 53- Two cap-cells of the same liberated by rapturing the gland under 
pressure. 
Figs. 54, 55. Germinating seedling of Armeria plantaginea , invested in (54) 
and free from (55) the calyx. Nat. size. 
Figs. 56, 57. Germinating seedling of Armeria latifolia , nat. size. 
Fig. 58. A Mettenian gland, g, in the above seedling of Armeria latifolia , 
at a very early stage of development. 
Fig. 59. A later stage of the same as in Fig. 58. 
Fig. 60. An advanced seedling of the same species, nat. size, m s, swelling 
indicating the position of the gland-bearing trough ; If leaf. 
Fig. 60 a. Young seedling Plumbago zeylanica , nat. size. 
PLATE XIII. 
Fig. 61. Cells of the base (-12 mm. in diameter) of a mucilage-gland from 
seedling Armeria vulgaris (Fig. 51). mr , mucilaginous boundary of the cell- wall 
after treatment with solution of caustic potash. 
Fig. 62. Cells of the base (*o8 mm.) of a mucilage-gland in a very young 
seedling, exhibiting the same feature as above. 
Fig. 63. Upper (secreting) surface of a mucilage-gland (-16 mm.) in a young 
seedling of Statice tatarica, after immersion in solution of caustic potash. 
Fig. 64. Basal cells of the same gland. 
Fig. 65. Mucilage-glands (mg) in the axil of the cotyledon of Statice Thouini. 
k , margin of trough formed by the fused bases of the cotyledons ; If leaf. 
Fig. 66. A portion of the same region more highly magnified. 
Fig. 67. Transverse section of the cup. mg, mucilage-gland ; If, \ young leaf. 
Fig. 68. Sessile gland on the inner face of the calyx of Plumbago scandens , 
•15 mm. in diameter, b, pyramidal basal cells. 
Fig. 69. A mucilage-gland at the base of the cotyledon of Statice duriuscula 
(long axis *18 mm.), with inner concentric division and general partition into four. 
Fig. 70. Sessile gland on the inner face of the calyx of Plumbago rosea , -12 mm. 
in diameter, b, base. 
