354 W . Neilson Jones. 
resources are not such as to make the acquirement of the Stomato- 
graph possible. 
The apparatus may, for convenience of description, be consi¬ 
dered to consist of three parts—(1) the recorder, (2) the modified 
porometer, (3) the driving mechanism. 
1. The Recorder (Figs. 1 and 2). The base BD 1 of the recorder 
may be constructed of either stout sheet cork or wood and 
is arranged to slide up and down two stout steel knitting needles 
A, A' held parallel in a wooden retort stand. To render this 
vertical movement as frictionless as possible, short lengths of glass 
tubing G, G', of such a bore that the knitting needles will just 
pass through them, are fixed into the base B B '. This arrangement 
