Flowers and Insects. 
543 
We see therefore that the skin contains, distributed over 
its surface, organs of at least two distindt kinds, each having 
its special inservation and its conduftion to the nervous 
cen res. We see, on the one hand, temperature-points, 
sensitive to heat or cold, but insensible to pressure or pain 
and so specialised that heat and cold fall under the co^ 
msance of distinct organs; on the other hand, we see 
pressure-points, very sensitive to pain and to pressure, but 
insensible to temperature. 
VIII. FLOWERS AND INSECTS. 
S FtE mutual lelations of flowers and insedts have mven 
_ rise ^ no little ink-shed. They have been seriously 
studied .by naturalists of merit — to mention names 
would here be invidious. They have been made the subiedt 
of smart “ readable ” gossip by dilettanti, and they have been 
altogether denied by certain “ survivals.” But since the 
death of Hermann Muller too little has been added to our 
solid knowledge on this most interesting subjedt. The 
reason why so little has recently been done in a region far 
from exhausted has been ascribed, on the one hand, to the 
difficulties of the statistical method, as used by Muller, and 
on the other, to the circumstance that a combination of 
entomological and of botanical knowledge is here required 
The observer must not merely be able to identify the flowers 
visited and the insedts which frequent them, but he must he 
acquainted with the morphology of the one and the other 
so that he may comprehend their mutual adaptations and 
the part their inter-relations have played in the evolution of 
vaiieties and species. Such a double acquaintance with 
flowers and insedts by no means falls to the lot of every 
naturalist. 
We may therefore congratulate ourselves that the question 
has been taken up anew by Prof. E. Low. This investigator 
proceeds from a different point of view to that adopted by 
the late Hermann Muller, and has reached some exceedingly 
important results, which have been consigned to the pages 
