26 
THE SCIENTIST. 
of these niineruia have undergone very 
singular transformation, some are in a state 
of decomposition, and others, which have 
made the mysterious transit from what they 
were originally to a new, and distinct physi- 
cal and chemical composition; the atmos- 
pheric, chemical and other agencies, acting 
upon and through the mineral, has made a 
complete and absolute transformation. 
One mineral in particular, (Spodumenc) 
has suffered a radical change in everv re- 
pect (excepting the form of its crystaliza- 
tion), possessing an entirely diff^-rent form 
chemically and physically, so that its 
original identity is entirely destroyed. 
What was originally called Spodumenc 
must now be termed Cymatolite, or what is 
called in mineralogical terms a Pseudomorph, 
after Spodumenc. But in the transition the 
slem.ents so mysteriously wrought upon have 
been changed into an immaculately white, 
pure mineral, so delicate, and silky and 
white as to suggest nothing but purity. If 
nature shall work so silently and beautifully 
within the secret recesses of her labaratory 
shall we be fearful to let her enter the holiest 
and sweetest of our thoughts, with the clear 
white light of her truth, and the lovely 
power of her strong and beautiful spirit? 
Fou THE SCIKNTIST. 
Tiie Kcokiiii Limestone and Coal Meas- 
ures of Pike Co,, Mo. 
BY li. 11. Rowley, Cukryville, jMo. 
There is but one locality in the comity 
at which I have noticed an outcrop of 
Keokuk Limestone, abontsix miles south- 
west of Curryville. on Indian Creek 
Only a few feet are here exposed which 
represents the base of the group, the 
Archimedes horizon. The layers of lime- 
stone are separated by thin partings of 
shale and the whole mass is well crowded 
with the remains of Biyozoa. The spiral 
axis (>f Archimedes owenanus nrc often 
very line ;ind the speciiiK'ns sometimes 
reach a length of nine inches and occa- 
sionally are complete. Tho fronds ;ire 
itsualiy free from the axes but in a few 
cases have beau found attached and give 
the collector some idea of a livi ig 
Archimedes. 
Other Bryozoa as Coscinum, Fenestella, 
Polypora. Ci/clopera and Cijcloporelhi ai-e 
fairly common. Amorjg Polyps are 
Zaphrentis sjmndoza, Z.sp?.an Amplexiis- 
like Cyathophylloid, a C/i«eieZes. a species 
of Syringopora and a fine Aulopora. 
Of Echinoderms two undetei-mined 
species of Batocrinu-i, Doricriims gouldi 
the detached spines of which are com- 
mon, a JBcmjcrinus, a crushed GrancUo- 
crinus, Troostocrinus wortheni^ Bary- 
crinus stellatus^ Oligoporus danae and 
A rcJioa ro c idar is keokuk. 
Of Mollucca there are but few imper- 
fect species, a Platyceras, a large Hemi- 
pronites, Spirifera pseudo lineata, S. 
keokuk and ^S*. logani and Produdcu^ 
semireticulatiis? Two or three imperfect 
pygidinms of a spine bearing Trilobite 
(Phillipsia) complete the fatma of the 
Keokuk Limestoiie in Pike Co.. outside 
of some unidentified forms. 
Coal Measures.— Along a branch 
about five miles north-east of Curryville, 
a few inches of a reddish clay shale, in- 
closing limestone nodnles, are exposed, 
and a few species of fossils are found 
free in the bed of the brook. Amojig 
t'lose picked up are the following species : 
Productus, pnnctatus, P. semireticulatus, 
P. longi.pinus, Chonetes mesolohn, C. 
smithi, Spirifera camerata, S. kentuckensis, 
S. lineata, Athyris hirsuta, A. subtHita, 
Bhynchonelia sp?, a Chae'etes and large 
Crinoid columns, Axophyllum rude.Betzia 
mormnne, spine-like plates of a Crinoid 
probably Belocrinus and Ptychostylus 
heterocostalis {?). 
lu one of our past articles we men- 
tioned the possible occurrence of the 
