ARUM MACULATUM AND ITS CROSS-FERTILIZATION. 289 
psgitee colouréd generally have the inside of the bulb of the 
e tint; but we have not been able to observe that the colour 
of ae spadix has any connection with the amount of spotting on 
the leaves or with any other peculiarity of the plant. 
the ers 
pe chen! oe this means must be considerable We have never 
known the leaves to be eaten, and as the tip or side of the spathe 
is rubbed off and nothing but the spadix is taken, it is evident that 
the extraction of this is the real object of the animal. That this 
should be eaten seems rather peculiar, for to us it is poisonous; 
tongue = sting sharply for some time after—often an hour or more. 
As e time of day when the spathes open, there seems to be 
some doubt, Very fresh-looking ones may often be seen in the 
early morning, and indeed at all times of the day; but Mr. bch 
is convinced that the majority -— in the evening about 5 or 6 
o’clock. This is certainly true of a number which we have ob- 
served growing, and of others which we have gathered and kept in 
water; but it is quite certain that all do not es at this time, and 
it is even probable that some open during the night. 
ediately following upon the unrolling of is i spathe some of 
the noon curious circumstances take place which occur in connection 
an nt in this country. The spadix : once begins to emit 
a strong smell, which to the senses of some people (Mr. Corder 
among them) presents itself as rather sweet and sickly, though not 
There is another peculiar Tr bateote din which is pretty much 
contemporaneous and co-existent with the smelling, namely, the 
emission of heat from the spadix,* which even makes the whole 
To what temperature above that of the atmosphere the club of the spadix 
may be raised by this natural heat we are unable to say, on account of our not 
having used a exaeitte suited to the purpose. The following figures were 
i e 
> 
ulb of a small common thermometer (F.); but it is en that to o tain the 
n 
previously existing temperature. The scent is arts sometimes given ou 
afte adi For instance, one spathe was fully opened, smelling 
a little and slightly warm at 9 p. n April 6th, 1882; early in the mo of 
the n ay was gone, but the smell co d, and a trace of it even 
remained until the following day, when the pollen was ie shed. In most 
spathes the smell does not la nee o long as this, but as the plant was growing in- 
doors it probably continued to ber: longer through want of fertilization. 
