WOODY TISSUES, 
89 
asserted that a hole really exists in the centre of each 
pore communicating with a similar hole in a neighbour- 
ing fibre. It is now, however, ascertained, by improved 
means of investigation, that these bordered pores are 
not confined to one fibre, but are formed between two 
contiguous fibres, and always exist in greatest number 
on the sides of the woody fibre parallel to the medullary 
rays. The bordered pores are hollow, their shape is 
bi-convex, as represented by c in Fig. 7 7 ; and a small 
fig. 77 . 
a , section through two contiguous 
woody fibres of Salisburia adiantifo- 
lia ; b c, portions of two contiguous 
woody fibres of Deal (Firms Strobus); 
d, one of the bordered pores of Pinus 
Strobus magnified 500 diameters. 
FIG 78 . 
A B 
a, two woody fibres of a fossil 
coniferous wood, with spiral fibres 
and bordered pores ; a a, casts of 
the interior of the bordered pores. 
b, fossil coniferous wood with three 
rows of bordered pores. 
circular or oval spot is visible in the centre of each. In 
some plants each fibre has one row of pores, in others 
two and in a few instances, as at B in Fig. 78, which is 
a representation of a specimen of fossil coniferous wood 
from Kennawha Ohio, the entire fibre is covered with 
them. In order to get a satisfactory view of these 
