of the Blue Gum of Tasmania, de. 123 
The appearance of the parts torn asunder leaves no room 
to doubt the fairness of the test. In some instances the 
smaller part drew 5 inches out of the ends, as far as the holes 
for the bolts, without breaking: this occurred generally in 
the wet or green pieces,—the substance of the wood between 
the fibres being doubtless less cohesive in this state than 
when dry. 
In the Table 1 signifies the length. 
a the breadth. 
d the depth. 
A the deflection. 
S the value of the strength, without 
considering the deflection. 
S’ the value of the strength, the de- 
flection considered. 
W the weight. 
C the cohesion. 
D the depth of the neutral axis. 
The depth of the neutral axis is not given in many of the 
experiments, it being found impracticable to ascertain it with 
nicety, from the irregular nature of the fractures : these, 
however, always evinced compression and tension clearly 
enough, whether the pieces were broken short off or rent 
along the grain, which sometimes, though rarely, occurred. 
The direct cohesion, by experiment, is given in each case, 
as preferable to that shown by the formula, the applicability 
of which, without reference to the discrepancies between the 
results, being, I think, questionable. 
