40. Q. What has observation shown as to the production of new cells in the highest plants? A. That they are not produced everywhere uniformly, but in particular spots.
41. Q. What terms have been applied to places of this kind? A. Growing-point, and growing or formative layer.
42. Q. Where may growing-points and formative layers be seen? A. Growing-points may be seen in the tips of buds, and formative layers between the wood and bark of trees.
43. Q. What names have been given to the tissue which is here formed by the division and union of cells? A. Formative or generating tissue.
44. Q. What are in direct contrast to the generation tissues? A. The healing tissues, or cork tissues.
45. Q. How are vessels made? A. By the union of several cells, the partition-walls disappearing, while the union continues at the margin.
46. Q. What are bast-tubes or bast-fibers? A. They are long, pointed, thick-walled tubes, commonly united into bundles.
47. Q. To what part of the flower is the term nectaries, or honey-glands, given? A. To any part of a flower which secretes honey or sugary fluids.
48. Q. What is the first independent tissue formed in flowering plants by the union of cells? A. The epidermis or skin.
49. Q. What is each of the pores found among the epidermic cells called? A. A stoma, or mouth.