220 
fused Cryolite, and constituting what is technically known as 
“Cast Porcelain.” One of these showed a portion to be 
transparent, whilst all of the rest were opaque. He considered 
that this was caused by the unequal cooling of the two portions. 
Such an effect being produced, as he had shown some years 
back, in blowpipe beads. When these are cooled suddenly 
they remain transparent, but if cooled slowly, the particles 
have time to arrange themselves in such a way that the mass 
becomes opaque. 
Mr. G. K. GILBERT made some remarks on the eccurrence 
of the Remains of a Mastodon, as illustrated by a specimen 
lately unearthed at St. Johns, Auglais County, Ohio. The 
question most commonly raised in connection with the 
remains of this creature was, as to whether they belonged 
strictly to the peroid of the deposits in which they were ~ 
found. That is to say, whether they had gone into the bogs, 
and having become mired therein had died in the places 
where they were found, or had they expired elsewhere and 
were their bones transported by water, or otherwise, into the 
bogs. Unfortunately this question could not be settled by 
appeal to most of the specimens discovered, as they are 
commonly separated in such a way as to present no signs of 
the mode of arrangement during life, or such points are 
unobserved by those who make the excavation. Fortunately 
the Ohio specimen presents us with an opportunity of solving 
this question conclusively. The Mastodon was found in a 
deep bog erect, just as he had been mired. He was headed 
for the nearest margin, with feet sprawled out as though 
struggling. The bones of each foot were in place, with the 
bones of the lower leg erect above them. Tusks, teeth, ribs 
and pelvis, all in appropriate positions. All the skeleton 
above the knees was more or less decayed. The animal 
probably stuck in the mud when it was but six feet deep, 
and two feet more have accumulated since. As the whole 
deposit is post glacial and above lacustrine action, being 450 
feet above Lake Erie, the date of the burial of these Masto- 
