om near the upper part of the Eagle
Ford at a point about two miles north from the Chisos Mining Company's
property. Brewster County, Texas. Slightly reduced.

[Illustration: PLATE VII]

PLATE VIII

Plate VIII. Photograph of a cast made by pouring plaster over a surface
of mud in which ice crystals had recently formed, in Rock Island,
Illinois, after the ice in the crystals had been removed by slow natural
sublimation into the atmosphere, leaving open cracks in the mud. The
comb-like ridges on the plaster cast have the form of the ice crystals.
Compare with Plate III.

[Illustration: PLATE VIII]

PLATE IX

Plate IX. Photograph of a cast made by pouring plaster over a surface of
mud in which ice crystals had formed, in Rock Island, Illinois, soon
after the ice in the crystals had been removed by slow natural
sublimation into the atmosphere, leaving open cracks in the mud. In the
locality where this cast was made, the crystals were relatively slender,
distant, and some gently curved, like those seen in Plate V. Slightly
reduced.

[Illustration: PLATE IX]

PLATE X

Plate X. Photograph of a cast made by pouring plaster over a surface of
mud in which ice crystals had recently formed, in Rock Island, Ill., and
where they had later been removed by natural sublimations into the
atmosphere, leaving open cracks in the mud. It will be seen that the
crystal growth in this case involves an x-like or radiating pattern
formed of relatively very slender forms that almost everywhere are very
gently curved somewhat reminding of the slender thread-like crystals
sometimes seen in frost on windows. I have not yet seen any similar
fossil crystal growths as slender as these. Slightly reduced.

[Illustration: PLATE X]

FOOTNOTES:

[A] Strand and undertow markings, etc., New York State Museum, _Bulletin
No. 196, April 1, 1917_, pp. 199-210; pl. 20-23.

[B] Brick clays of Rhode Island, Massachusetts; Marbut and Woodworth,
_U.S. Geol. Survey, 17th Ann. Rep., Pt. 1_, p. 992.

Transcriber's Notes:

Passages in italics are indicated by _underscore_.

Printer's inconsistencies in spelling and punctuation have been
retained.

End of Project Gutenberg's Fossil Ice Crystals, by Johan August Udden

*** END OF THIS PROJECT GUTENBERG EBOOK FOSSIL ICE CRYSTALS ***

***** This file should be named 33760.txt or 33760.zip *****
This and all associated files of various formats will be fou