806 DIONZA MUSCIPULA. Cnar. XIIL 
ment of the whole lobe was well seen in a leaf to 
which a large fly had been given, and from which 
a large portion had been cut off the end of one lobe; 
so that the opposite lobe, meeting with no re- 
sistance in this part, went on curving inwards much 
beyond the medial line. The whole of the lobe, from 
which a portion had been cut, was afterwards removed, 
and the opposite lobe now curled completely over, 
passing through an angle of from 120° to 180°, so 
as to occupy a position almost at right angles to 
that which it would have held had the opposite lobe 
been present. 
From the curving inwards of the two lobes, as they 
move towards each other, the straight marginal spikes 
intercross by their tips at first, and ultimately by their 
bases. The leaf is then completely shut and encloses 
a shallow cavity. If it has been made to shut merely 
by one of the sensitive filaments having been touched, 
or if it includes an object not yielding soluble nitro- 
genous matter, the two lobes retain their inwardly 
concave form until they re-expand. The re-expansion 
under these circumstances—that is when no organic 
matter is enclosed—was observed in ten cases. In all 
of these, the leaves re-expanded to about two-thirds of 
the full extent in 24 hrs. from the time of closure. 
Even the leaf from which a portion of one lobe had 
been cut off opened to a slight degree within this same 
time. In one case a leaf re-expanded to about two- 
thirds of the full extent in 7 hrs., and completely in 
32 hrs.; but one of its filaments had been touched 
merely with a hair just enough to cause the leaf to 
close. Of these ten leaves only a few re-expanded 
completely in less than two days, and two or three 
required even a little longer time. Before, how- 
ever, they fully re-expand, they are ready to close 
