1 66 Mr. Bauer's experiments on the colouring matter 
water, I carefully separated the colourless crust, and taking out 
of the glass the greatest part of the red sediment (which I 
intended for another experiment, but which failed, and shall 
be described hereafter) I filled the glass again with water, 
and left it at rest for several hours ; when the few fungi 
which were left in the glass, formed a slight sediment of 
about part of an inch in thickness, at the surface of 
which the colourless crust, about parts of an inch in thick- 
ness, remained. Fig. 1. in the annexed Plate (Pi. XVII.) 
is a correct representation of the glass, and the quantity and 
proportion of its contents. 
On the 1,0th of December, 1819, when we had the first 
fall of snow, I marked with a diamond on the glass the 
precise height of the mass of sediment it contained, and after 
carefully draining off the water, I filled the glass with snow, 
which I pressed in as hard as I could, by which means the 
fungi became completely mixed and immersed in the snow. 
Thus prepared, I put the glass into a wire bird cage, to pre- 
vent its being disturbed by birds, or any thing else, and 
placed the cage in a N. W. aspect, in the open air. The 
weather was then very cold, and on the following morning, 
the 11 th of December, the thermometer was 2 6 degrees 
below the freezing point. On the 13th of December the 
weather suddenly changed and became milder, and about 
noon the snow in the glass was entirely dissolved ; on exami- 
nation, after the glass had been fifty-two hours in the open 
air, I found the whole contents had formed a sediment, and 
had become of the same red colour as the original sediment 
was ; but no increase in quantity was then perceptible ; see 
Fig. 2. 
