The Salt Lake herald. [volume] (Salt Lake City [Utah]) 1870-1909, 1896-01-25
PROFESSOR WHITING.


Professor Whiting spoke of the depend
ence of one form of insect upon another,
mentioned and explained many species OF
insects and spoke very interestingly upon
the senses of insects. Insects have sew
eral senses not possessed by man. There
are two classes of eyes possessed by
insects. one class resembling the eye
OF man and another class called the
compound eye, generally In the shape of
hemisphere with many fat surfaces
called the faces of the eye. Each face
has separate sense.
Many insects being small and weak
are provided with means Of escape from
their larger enemies. The insects spec
tally mentioned and explained were the
different forms of flies, bugs and bees.
There is a great dependence through
out nature of one portion of the crea-
ton upon others. Nature is the great
book of GOD. which we may all study if
we will but educate ourselves to the
language of this book
The lecture was very much appreciated
by the students.
DIR. TALMAGE.
Beauty revealed by crystal forms is
of the highest type, the exhilation of laws
of order, producing harmony Crystal
constitution is shown not alone by ex-
ternal form more or less symmetrical,
but by a characteristic internal struc-
ture. Force, such as light. heat, and CO.
hesive attraction manifest themselves
with varying intensities in different di-
rections within the crystal. Shown by
erals e. e. galepite, cleaves as cubes;
calcite shows rhom bohedral cleavage,
etc. CryStallizing force appears to be a
variety OF cohesive attraction. Analogy
is seen in the speroidal form of liquids.
Free a liquid body from the disturbing
effects of adhesion and its particles will
cohese with globular arrangement, Il
luStration, dew, and rain drops; oil sus-
f7caE Of
jty; e. e. in mixture of alcohol and water;
sDheroidal form of water when dropped
on hot surface. AS liquids tend to form
spheres, so solids tend to form crystals.
EXamDles-Saturated solution of alum.
salt, or sugar by standing and partial
evaporation deposits the solid in crys-
tai form. Particles of solid body must be
free to move in order that crystals may
be produced; hence solution, fusion, va
poriZation, shaking assist the process.
Crystal grows by accretiOn; it is there
fore Enthusiastically different from liv-
ing matter, Snow is cryStalliZed water;
structure is shown by the microscope.
The forms of crystals are numerous,
while the systems are few and of simple
relation-D Isometric, cubic, or regular
system. characterized by three axes.
equal. rectangular intersections. (2) Di-
metric, tetragonal, or quadratic sys-
tem-three axes, rectangular intersec-
tions, two lateral equal, and unequal to
vertical. 90 Trimetric or orthorhombic
sYstem-three axes. rectangular: all un-
equal. a. Monoclinic or oblique-three
axes, unequal. one oblique intersection.
(5) Triclinic-three axes, unequal all
obliuue intersections. Co HexagOnal-
four axes: one vertical at right angles
to three lateral; lateral at angle of so
degrees. Angles between corresponding
faces are constant A substance may
crystalline under varying conditions in
different systems; then such is said to
be dimorphic, trimorphic, or polymor-
phic; yet even in such variation there is
constancy. the same conditions always
producing the same form.
Thus. even in inanimate matter, the
particles are subject to laws of order:
even mud tends to publication, crystal
lization, perfection.
NOTES.
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