Geology and Mineralogy. 241 
- On the Silictc Ethers of the Phenols —Manrtin1 and WEBER 
have called attention to the facility with which the silicie ethers 
of the phenols may be prepared by heating silicon tetrachloride 
with on excess of the phenol. In this way they have obtained 
tetraphenyl orthosilicate Si(OC,H,), and tetra-p-cresyl orthosili- 
oe Si(OC,H.),. Both of these bodies may be distilled un- 
cha 
basin, show no perceptible diminution of their power, as 
performances of these geysers at our visits in 
1881 and 1882. The Castle, Bee-Hive, Old Faithful, Saw-Mill 
and Turban Geysers appear to perform just as they did ten years 
ago, The Grotto Geyser may have increased a little in frequency 
and diminished in duration, and the Grand and Giantess have 
changed somewhat in character and for the better, as will be 
seen by the following notes. ; é 
_ Grand Geyser—Dr. Peale records the following observations 
mm 1872; 
August 18.—One continuous eruption, lasting 15 minutes. 
al ms i : s 
Second eruption, fodr minutes; interval, ten minutes. 
eruption, nine minutes. Total time, t 
n 
With short intervals, one to three minutes; total time estimated, 
es 
thirty to forty minutes; and on the same day, two hours later, 
the same performance was repeated. 
August 26.—A succession of seven eruptions, as before; not 
Tepeated that day. : : 
August 19, 1882.— (Reported by eye-witnesses.) Geyser 
Am. Jour. Sor.—Tammp Serres, Vou. XXVI, No, 158,—Sepr., 1883. 
