100 TRANSACTIONS OF THE [Nov. 20, 
soil covered by weeds, etc., but after this is removed the earth 
“an. be spaded out in a condition of great purity. 
4. Chub Pond.—This is a body of water covering about five 
acres and located at a distance of a little over a mile southeast 
of Big Crooked Lake. The water is about two and one-half feet 
deep and has a mud bottom, but upon probing this mud Mr. 
Wood found that it was underlain by a rather impure diatoma- 
ceous earth which he was able to trace toa depth of twenty feet. 
He thinks, however, that he had not reached the bottom of it, as 
he had not the means at hand of going deeper, but he reports 
that the lower he probed the purer the earth became, the last of 
the twenty feet being almost white. 
5. Pond North of Big Crooked Lake, about a quarter of a 
mile long, contains diatomaceous earth recognizable over an area 
of about one acre. Mr. Wood estimates that this earth in a 
comparatively pure condition extends to an average depth of 
about three and one-half feet, but mixed with mud and other 
foreign matter it is traceable over a much larger area than that 
wre above. 
Hawk Lake contains, according to Mr. Wood’s estimate, 
ee one and one-half acres of diatomaceous earth of from four 
to five feet in depth, but it has not the appearance to the naked 
eye of being very pure, as it seems to have some dark substance 
mixed with it. Beyond the one and one-half acres mentioned, 
Mr. Wood found extensive traces of it more or less contamin- 
ated with mud and muck. 
‘7. The Lower of Five Ponds, the size of which has not been 
given me, is said by Mr. Wood to be entirely underlain by diato- 
maceous earth ranging from one to eight feet in depth, averaging 
as he thinks about three feet. 
8. Clear Lake.—This appears to be another of the Five Ponds 
which constitute the head waters of Cranberry Lake,and in this 
Mr. Wood thinks there are about three and one-quarter acres of 
diatomaceous earth whose depth he has not determined. 
Besides the deposits specifically described, Mr. Wood has ex- 
amined several small ponds containing more or less of the same 
formation, but not in sufficient quantity or of such purity as to 
make it valuable in his eyes; and, as he conducted his explora- 
tions with a view to the commercial value of the material for 
which he was searching, he did not think these ponds worth the 
trouble of measurement or other detailed examination. 
The samples sent me by Mr. Wood from the several deposits 
which he examined are all of exceptional purity and capable of 
being prepared for the microscope by the most superficial 
method of cleaning. Under the lens they appear much alike as 
