BY INFERIOR ORGANISMS. 125 



maria" (Noctiluca) to a magnifying power of 

 thirty diameters,, he saw some of them become 

 brilliant 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 light seemed concentrated in them, whilst 

 the homogeneous luminosity of the animalcule dis- 

 appeared. Ehrenberg considers these brilliant 

 points to be so many light-emitting organs. 



