4 
WAKD’S NATURAL SCIENCE BULLETIN. 
SYSTEMATIC COLLECTIONS OF 
MINERALS. 
After much experience and careful study of the 
needs of both teacher and pupil, we have pre- 
pared systematic collections of typical minerals, 
adapted to the requirements of our larger and 
smaller institutions, as follows : 
I. COLLEGE COLLECTION - . 
Its 280 specimens, covering the ground evenly 
and fully, are further supplemented by a series 
of 50 crystal models and a set of 40 imitation 
precious stones, showing the principal minerals 
employed in jewelry. The specimens are all 
numbered to correspond with a printed descrip- 
tive catalogue accompanying the collection, ac- 
curately labelled, and each specimen mounted on 
a black walnut block. In the case of single 
detached crystals, these are similarly mounted, 
supported on special brass holders. The precious 
stones are in a neat case by themselves. This 
collection we supply packed, ready for delivery, 
at $250. 
II. ACADEMY COLLECTION. 
In this the specimens number 180, and are dis- 
tributed as follows: 
Elements - 8 
Sulphides, etc... 14 
Chlorides and fluorides 6 
Oxides. 45 
Silicates 64 
Phosphates, etc 8 
Sulphates. ... 10 
Carbonates — 18 
Hydrocarbons - 10 
The classification adopted in this, as in all our 
mineral collections, is that of Dana’s System of 
Mineralogy. This collection mounted same as 
the preceding, $100. 
III. SCHOOL COLLECTION. 
This collection omits the rarer and more ex- 
pensive species found in the preceding, but con- 
tains 120 specimens of good quality and size, 
mounted in the same style, on walnut blocks, 
with crystal holders, clearly printed labels, 
giving name, locality, crystaline form and chem- 
ical formula, price $50. 
While these collections are primarily intended 
for use, the fact has not been overlooked that 
beauty is not necessarily incompatible with this 
object, and hence, where it was possible to have 
the latter without sacrificing the former, we have 
sought to combine both, and can safely say that 
no more attractive ornaments for a school room 
could be chosen than these series make. 
IV. STUDENTS’ COLLECTIONS. 
To meet the demand for still cheaper collec- 
tions, we have prepared one containing 60 speci- 
mens, smaller in size, but clear and typical, and 
selected to cover the ground evenly from gold 
to the hydrocarbons. These are arranged in 
three trays with compartments 2% x 3 inches, 
which fit into a nicely finished case furnished 
with lock and key. 
Price, with hard wood case, $15 00 
“ “ soft “ 12 00 
The same collection will be furnished without 
case, simply numbered to correspond with printed 
list, for $10. 
Still smaller and cheaper collections can be 
furnished if desired, as well as larger and more 
expensive ones. 
PHYSICAL AND STRUCTURAL 
SERIES. 
In addition to the individual Minerals and the 
Systematic Collections above mentioned, we 
have prepared various special series of specimens 
to illustrate the Physical and structural Properties 
of Minerals: 
Lustre, Color , Diaphaneity , Fusibility , Specific 
Gravity, Hardness, State of Aggregation, Fracture , 
Structure, external form. 
We also offer suites of CRYSTAL MODELS 
of various sizes, in solid glass; in plate glass with 
axes and angles shown by colored threads ; in 
wood (some revolving to show combinations), 
and in plaster (white or with colored faces). 
Send for our catalogue, price 20 cents. 
MARK TWAIN’S LAST. 
He Discusses the Carson Fossil Footprints— ’‘They are 
not Fossilferious, They are Legislative.” 
San Franciscan, February 16. 
It may be all very well for Professor Marsh 
and Professor Iiarkness to talk their scientific 
talk about the Carson Footprints, and try to sad- 
dle them on the Primeval Man, the Irish Elk and 
others who are gone and cannot defend them- 
selves; it may be all very well, I say, and enter- 
taining, and within the just limits of scientific 
slander and research, but it is not moral. For I 
know the cold facts about the Footprints, and I 
know they were not made by the Primeval Man, 
or the Irish Elk or any of that sect; they were 
by the first Nevada Territorial Legislature, and 
I was there when it was done. It was done at 
the time of the sine die adjournment. It had 
rained rain all the evening outside, and it 
had rained whisky all the evening inside— inside 
the fence, I mean, for there were no buildings at 
that early day — and neither you nor a much old- 
er man could have told on which side of the fence 
the weather was the most inclement. I was on 
both sides of it, for a brief, uncertain season, and 
I couldn’t tell. The Footprint quarry, where 
that Legislature sat — stood, while they could, I 
mean — was a dry alkali flat, with a fence around 
it, when the rain began, just a dry, alkali flat, 
containing a fenceful of dry honorable al- 
kalied flats from all over the Territory; and in 
three hour’s that first mentioned flat was absolute- 
ly soaked to the depth of three inches; and the 
others all the way through. I make no excep- 
tions; I say all, I was there and I know. So 
the place was becoming a regular marsh, full of 
irregular Marshes, so to speak — meaning the leg- 
islature, but intending no disrespect. And when 
the weather moderated so that no one could ven- 
ture outside— outside the fence — these latter ad- 
journed. They adjourned in the usual form — 
form used by territorial legislatures of that day — 
the speaker bringing down his gavel on the head 
of the member mistaken by these scientists for 
the Irish Elk — which he, the Speaker, mistook 
for the fence-post — and thus, as you §ee, is the 
gloom and sorrow of a double error spread over 
this mouldering historic incident — and said- 
common time, four beats to the measure, that is 
to say, four hiccoughs to the sentence: “The 
modder having weatherated,” and so on, in a 
similar strain, till he got through. I remember 
it as if it had been but yesterday. Thus dis- 
solved, they departed thence. 
It was then that they made the tracks. They 
couldn’t help making them; for the place was a 
marsh, as I was telling you. I saw it done, for 
I was there. I was there, and I shall now cast 
upon this pale dim void of scientific conjecture 
the lurid glare of history. I was there and I saw 
them march. The Primeval Man was absent, the 
Irish Elk did not arrive; the Cave Bear responded 
not to the summons; the Old Silurian Ass got 
left. The menagerie was wholly local. Part of 
it I saw, and the rest of it I was. This is history; 
this is cold history; and history cannot lie. 
The speaker went first. He made the large 
tracks — the ones that are eight inches broad and 
eighteen inches long, and resemble the footprint 
of a champagne basket. He was a prime man 
in two or three ways, and evil in forty; but he 
was not the Primeval Man, just the same: reflect 
upon this. I was there; I was there all the time; 
and I knew him well. He made the large tracks. 
And he did it without an effort. He could have 
done it with one hand tied behind him. He said 
so himself; he didn’t tell me so, but he told others 
so, though I knew him well. His name was 
Welch; either Welch or Sanders, I don’t know 
which ; but it was a name that sounded like those. 
He was a rancher; kept a ranch; cattle ranch; 
and did not wear shoes, snch not being his cus- 
tom, though a praying man from his mother’s 
knee. And always when he went forth ranching 
with all his might into the pasture among the 
cattle, there was much hay and straw lying scat- 
tered about, and with it much other material — 
materia] of a plastic nature; mud, to wit; acres 
of it; and this material and the straw did of a 
truth and by custom combine and form unto 
him uncreated sandals, as you may say uncre- 
MINERALS FOR CHEMICAL PURPOSES. 
The prices quoted are per pound (avd.) The 
more expensive kinds will be sold at the same 
rate per i and i lb. 
Actinolite. $ 05 
Albite 05 
Allanite 15 
Alunite - - 35 
Amber. 1 00 
Amphibole 05 
The rest of this list (from Anhydrite to Zircon), 
which, for want of room we are obliged to throw 
out, will be furnished on application. 
SELECT BLOWPIPE SERIES. 
The following series includes all the more im- 
portant minerals used in blowpipe analyses. 
In glass bottles, ready for use, 5.00. 
Hand specimens of the same minerals, about 2 x 
2^ inches, 7.00. 
Actinolite PSi0 3 . 
Amber C^ 3 H 10 O tl . 
Apatite 3Ca a (P0 is ) Ca{Cl.F) 2 . 
Arsenic As. 
Barite BaSO i . 
Beryl BeAl.Sil. 
Bismuth Bi. 
Calamine ZnSil- 1- H. z 0. 
Calcite CaC0 8 . 
Cannel Coal C&c. 
Cassiterite Sn0 2 . 
Celestite SrSO±. 
Cerussite PbC0 3 . 
Chalcocite Cu 2 S. 
Chalcopyrite ( Cu , Fe) S 2 . 
Chromite FeCrO±. 
Cinnabar HgS. 
Corundum Al 2 0 3 . 
Cryolite Na 6 Al 2 F 12 . 
Dolomite ( CaMg ) C0 3 . 
Enstatite Mg Si 0 3 . 
Fluorite CaF 2 . 
Franklinite ( FeZnMn ) Fe a Mn 2 O i . 
Galenite BbS. 
Garnet TfiFeAl) Sil. 
Graphite C. 
Gypsum CaSOi-f 2H 2 0. 
Halite Ha Cl. 
Hematite Fe 2 0 3 . 
Hornblende BSi0 3 . 
Kaolinite Al.SilA r 2H 2 O. 
Limonite 2Fe 2 0 3 -\-3H 2 0. 
Magnesite MgC0 3 . 
Magnetite Fe a O±. 
Malachite CuC0 3 -\- Cu{OH) 2 . 
Muscovite H 2 Al.Sil. 
Molybdenite MoS 2 . 
Orthoclase KAl.Sil. 
Pyrite FeS 2 . 
Pyrolusite Mn0 2 . 
Pyrrhotite (Nickeliferous) FeS 2 . 
Quartz Crystal Si0 2 . 
Rutile Ti0 2 . 
Serpentine MgSil-\-2H 2 0. 
Siderite FeC0 3 . 
Sphalerite ZnS. 
Stibnite Sb 2 S 3 . 
Stilbite CaNaAl. Sil. 
Strontianite SrC0 3 . 
Talc HMg.Sil. 
Tourmaline AlFe MgMnK Nd Li. F Bo & . Sil. 
Witherite BaCo z . 
