[Illustration:  FIG. 25.]

(2) The black band with white dots round the marrow, represents the marrow-sheath.

(3) From the marrow-sheath run the marrow-rays ’dividing the vascular circle into numerous compact segments.’  A ‘ray’ cannot divide anything into a segment.  Only a partition, or a knife, can do that.  But we shall find presently that marrow rays ought to be called marrow-plates, and are really mural, forming more or less continuous partitions.

(4) The compact segments ‘consist of woody vessels and of porous vessels.’  This is the first we have heard of woody vessels!  He means the ’fibres ligneux’ of Figuier; and represents them in each compartment, as at C (Fig. 25). without telling us why he draws the woody vessels as radiating.  They appear to radiate, indeed, when wood is sawn across, but they are really upright.

(5) A moist layer of greenish cellular tissue called the cambium layer—­black in Figure 25—­and he draws it in flat arches, without saying why.

(6), (7), (8) Three layers of bark (called in his note Endophloeum; Mesophloeum, and Epiphloeum!) with ‘laticiferous vessels.’ [43]

(9) Epidermis.  The three layers of bark being separated by single lines, I indicate the epidermis by a double one, with a rough fringe outside, and thus we have the parts of the section clearly visible and distinct for discussion, so far as this first figure goes,—­without wanting one letter of all his three and twenty!

17.  But on the next page, this ingenious author gives us a new figure, which professes to represent the same order of things in a longitudinal section; and in retracing that order sideways, instead of looking down, he not only introduces new terms, but misses one of his old layers in doing so,—­thus: 

His order, in explaining Figure 96, contains, as above, nine members of the tree stem.

But his order, in explaining Figure 97, contains only eight, thus: 

(1) The pith. (2) Medullary sheath.  Circles.

(3) Medullary ray = a Radius.

(4) Vascular zone, with woody fibres (not now vessels!) The fibres are composed of spiral, annular, pitted, and other vessels.

(5) Inner bark or ‘liber,’ with layer of cambium cells.

(6) Second layer of bark, or ‘cellular envelope,’ with laticiferous vessels.

(7) Outer or tuberous layer of bark.

(8) Epidermis.

Doing the best I can to get at the muddle-headed gentleman’s meaning, it appears, by the lettering of his Figure 97, my 25 above, that the ‘liber,’ number 5, contains the cambium layer in the middle of it.  The part of the liber between the cambium and the wood is not marked in Figure 96;—­but the cambium is number 5, and the liber outside of it is number 6,—­the Endophloeum of his note.

[Illustration:  FIG. 26.]