368 
Notes . 
fibres (set.) marks the position of the angle, and the radii are formed by 
single rows of sclerotic cells (j&), of the same shape and size as those 
of the cortical parenchyma; in each of these cells the wall nearest 
the bundle is much thickened, strongly lignified, and deeply pitted. 
The arc of the sector is denoted by a prominent band of crushed 
phloem (cr.), often four or five cells thick, in which the sieve-plates 
can be distinguished. The xylem forms a small segment of a circle 
Diagram of cortical bundle of Calycanthus occidentalis, Trans. Sect, of young 
stem. x n Xylem of bundle-ring. ph n . Phloem of ditto. p l . Parenchyma between 
the cortical bundle and the normal phloem, cr. Crushed phloem of cortical 
bundle. ca l . Cambium of bundle-ring. C. Cortex. p> 1 . Parenchyma of cortical 
bundle, scl. Band of sclerenchyma. sh. Sclerotic sheath. x c . Xylem of cortical 
bundle. ph c . Phloem of ditto, ccd. Cambium of ditto. AB and ab indicate 
the position of the radial and tangential sections referred to. r. Recesses between 
xylem and sclerotic sheath. 
with its base applied to the middle of the base of the band of 
sclerenchyma (x c ). The length of the base of the former is one-third 
to one-half that of the latter. A cambial zone (ca.) borders the 
convex edge of the xylem, while the whole remaining space is oc- 
cupied by phloem ( ph c ). 
Between the inner (phloem) edge of the cortical bundle and the 
