154 Scientific Intelligence. 
naphtha; gives a pale red solution. In boiling rectified petro- 
leum, free oe naphtha an nici slightly more soluble than 
in naphtha; es a pale red solut 
Subjected és dry ransom a Sicicsk tarry oil passes over, 
mixed with green-colored wa This water is decidedly acid to 
cea At first the oil eae a specific _sravity less than that of 
r, but after a rg days sinks in the This oil and water 
quantity. Iam of the opinion that the amount does not exceed 
5 per cent, but this was not determined accuratel 
rom the examination this mineral may be pronounced an acid 
hydrocarbon, or fossil cerite, more or less oxidized and more or 
less impregnated with clay. From its varying solubilities, it is 
probably a mixture of different hydrocarbon compounds. 
s this mineral is found in Ione valley, I would propose to 
name it from the locality, Zonite. To what industrial uses Tonite 
may be applied, has not yet been investigated, and it is foreign 
the purpose of this paper to inquire.— Wining and Scientific 1 ness, 
March 24, 1877. 
20. Cyrstallization of Silica ; P. Hauterevitie.—If amorphous 
silica is kept in sodium tungstate at the temperature of fusion of 
silver, silica cayatedlis zes in minute crystals of the species tridy- 
mi the temperature is kept long at 1000° C., the tridymite 
is obtained in thick hexagonal scales. Sp. = 2°30 at 16° C. 
Tridymite is as aera than quartz when acted upon by the 
wet or dry proc 
By means — para of soda, amorphous silica or tridymite 
ed to quartz. At a temperature of 750° C., or that 
just saihchant to hold the tungstate in fusion, the grains of am morph- 
ous silica disappear ; and after several hun dred hours of heating, 
double ae onal pyramids of quartz are obtaine p- gr. 
2°61 — 2°65. The crystals contain a trace of tungstic acid and 
0-003 per cae of soda. 
The crystallization is so slow at 750° C., that practically it is 
necessary to adopt the following method: the silica with the 
tungstate is made to oscillate in temperature many times between 
800° and 950°; with the increasing heat the silica combines with 
the soda, and with the decrease, the silica is Spee aes fete the 
tungstic acid. At the peanechi seis ement of each period of cooling 
the silica takes the form of tridymite, but as the Saipesice falls 
below about 850° = I takes that of quartz.— Bull. Soc. Min. de 
ance, No. 1 Ane 1878. 
21. te-—M. Scuvsrer has examined the tridymite from 
an obgosiionien chyte of Monte Gioino near Tiolo in the Euganean 
Hills (Northern Italy), and concludes that its crystals are twins 
under the triclinic system, its optical characters affording evi- 
dence in favor of this a u. petrogr. Mittheil. 
herausg. v. G. Tschermak, Heft 1 
