OF THE WOOD OF INDIAN SPECIES OF PINUS. 465 
and in that they do not usually continue in the same straight line through a 
number of tracheids. These bands are the structures that we term “ Sanio's 
rims.” 
Not in any one among these three kinds of markings in the wood is the 
bar, plate or band composed of cellulose. 
Miss Gerry, working with Professor Jeffrey, in her paper on the “bars 
of Sanio," was obviously not dealing with “ Sanio’s bars” but with the 
structures that we term Sanio’s rims. She describes them as “bars” or 
* Folds? of cellulose and specifically mentions their presence in Pinus. In 
this genus we have shown that these bands are not ridges, bars, or folds 
projecting into the lumen, but occur at regions of the wall where this is no 
thicker than elsewhere, and that each consists of a locally thickened pectic 
middle lamella overlaid by lignified layers. The evidence of the cellulose 
nature of these bands provided by Miss Gerry is quite inadequate, since the 
sole fact given by her in support of her statement is that the bands stain 
with hematoxylin. We entirely failed to make these structures stain with 
this dye excepting in the form of iron-hematoxylin, which of course may be 
readily deposited as a stain in pectic bodies and particularly in the middle 
lamella of wood. Hence it remuins to be seen if these bands are composed 
of cellulose in any of the Conifers. 
(7) Structure of the Bordered Pits on the Radial Walls. 
In the spring-wood the bordered pits on the radial walls are larger and 
generally have broader orifices. In the summer-wood the orifices are more 
or less fusiform and more approximating to the vertical oblique, and may be 
continued out with long oblique furrows arranged in a steep spiral. 
(q) Bordered Pits on the Tangential Walls. 
Only two Indian species, P. excelsa and P. Gerardianá, regularly show 
pits on the tangential walls of all the outer summer-tracheids. 
Tangential pits are known to occur sporadically in narrow annual rings of 
various Abietineze (see Strasburger). They occur in P. longifolia, P. Khasya, 
and P. Merkusii, in spring-wood or summer-wood, but in the last two species 
they are abundant especially in the spring-wood in the radially deflected 
bundles of tracheids already described, though the annual ring was broad in 
our specimen of P. Khasya. Small bordered pits occur on the tangential 
walls on the radially outer and inner sides of the tracheids around the resin- 
ducts, at least in some Indian species of Pinus, e. g., P. Gerardiana and 
P. excelsa. 
