ee ee 
perfectly, but its first attempt was just before sunset ; and in 
that posture it remained till the same hour the second day, 
when it opened, and on the third day still wider, but not 
fully, and on the next morning it began to shrivel and to 
grow red on the outside of the sepals, as C. Drummondi 
does. It has the same primrose-like fragrance as that 
species. Its petaline filaments are a little prolonged. J 
have been puzzled about the capricious non-expansion of 
the Cooreriss; but I think I now understand them. En- 
creased temperature does not aid it, but prevents it, and 
probably would of any nocturnal flower: the thing neces- 
sary for its expansion seems, on the contrary, to be the de- 
crease of the mean temperature. The requisite is, there- 
fore, a given mean temperature, and the decrease which oc- 
curs in the evening. In the stove, or greenhouse, unless 
the sun shines all day, there is not that decrease of the tem- 
perature at sunset which causes it to open, and therefore 
its expansion is sluggish and imperfect : and it so happened 
that the weather was very cloudy and cold, and when the 
lights were shut, the house in which this bulb stood was 
warmer than it had been in the day. The second day was 
warmer, and the third still more so, though all cloudy, there- 
fore there was a greater difference in the pat which 
caused those three efforts of the flower, If I had placed 
the plant in the open air the day before its expected expan- 
sion, I am confident that it would have opened flat. C. 
Drummondi, set out of doors before expansion, opened flat 
at night, and continued so three days. In the stove in cold 
weather it never opened at all, because there was no de- 
crease of temperature.”’ nh he 
Fig. 1, 2. Section of the Flower showing the situation of the Stamens 
and the length of the Style from Dr. GRaHAM’s SCEPTRANTHUS Drum- 
mondi, from a sketch by the Hon, and Rev. W. Herbert :—magnified to 
twice the natural size. 
