Paet II.] Teoup : Fissilility of some Indian Woods. 37 
(c) Cross-grained woods show on the radial surface a series of 
ridges and furrows, usually in parallel rows, the depth and 
roughness of the furrows depending chiefly on the degree of 
“ crossness ” of the grain. The tangential surface docs not 
show this stracture, being comparatively smooth. The ridges 
and furrows referred to appear to correspond, in some cases at 
least, with the concentric rings of growth, the fibres altering 
their course with each successive ring : whether or not this is 
universally the case it is difficult to say, as the concentric rings 
cannot be distinguished clearly in many cross-grained woods. 
6, Further Experiments Desirable. 
The experiments described here, although they extend to a fair number 
of common Indian woods and some rarer ones, do not pretend to be 
exhaustive, and it is desirable that they should be supplemented from time 
to time by further tests. The splitting apparatus is at the Forest 
Research Institute, Debra Dun, and similar tests can be carried out 
without difficulty in the case of woods which Forest Officers and others 
may be good enough to send for the purpose. 
