74 
ON THE ATMOSPHEEE IN RELATION TO PUTREFACTION ETC. 
violet light impinges on it * ; sending such a beam through any of the infusions, the 
“ degradation ” of the violet to green is strikingly illustrated. 
The foregoing statement refers to the deportment of the infusions after boiling and 
filtering. Prior to boiling some of them were of a brilliant ruby colour ; but even here, 
when the layer of liquid between the eye and the beam was not too thick, the green 
fluorescence could be seen through the red liquid. 
On plunging the eye into the beam of the electric lamp, transmitted through violet glass, the moment the 
crystalline lens is seen to fluoresce by a second observer, a blue shimmer is seen by the eye on which the beam 
falls. In the case of my own eye, I can always readily tell when the fluorescence has set in. 
