BY INFERIOR ORGANISMS. 125 
maria’? (Noctiluca) to a magnifying power of 
thirty diameters, he saw some of them become 
brilhant on one part of their body only, others on 
many points, and others again on their whole 
surface. On increasing the magnifying power 
from sixty to one hundred and forty diameters, 
more and more brilliant points became luminous. 
The hight seemed concentrated in them, whilst 
the homogeneous luminosity of the animalcule dis- 
appeared. Hhrenberg considers these brilliant 
points to be so many hght-emitting organs. 
