498 H. B. Hill—Ethers of Uric Acid. 
I. MOUNTAINS COMPOSED OF SEDIMENTARY STRATA, ALTERED OR UNALTERED. 
I.—Appalachian Structure. 
(Not found in the three provinces.) 
TL fe conta Anticlinal Structure. 
Primary topographic form: Plateau with rounded vertical outline 
Concomitant forms: 1. Mon odin Ridges on the Flanks. 2. Monoclinal 
Ridges only. 3. Inclined Plateau 
UL.— Uinta Structure. 
Primary topographic form: Plateau with rounded summit and abrupt shoulders 
on the flank. 
Concomitant forms: 1. Subsidiary Plateaus. 2. Projecting Ridges. 3. Axial 
Peaks. 4. Flanking Peaks. 5. Interrupted Monoclinal Ridges. 
IV.—Kaibab Structure. 
mary ny ag form: Plateau with — outl 
imesh forms: 1. Cliffs of Displacement. 2 Bopet of pe Big 
3. Interrupted Mon doting Ridges on the Flanks. Monoclinal Ridges with 
Plateau carried a nef 5. Projecting Ridges. 6. Cliffs of Erosion. a B uttes. 
8. Cameo Mountain 
—Basin Range Structure. 
V. 
Primary topographic form: Monoclinal ig Nah - Ja capoaiae 
Concomitant forms: 1. Monoclinal ridges on t 
Vi—Zones of Diverse premngy 
Topographic form : Raatieed hills. 
Il. MOUNTAINS COMPOSED IN WHOLE OR IN PART OF EXTRAVASATED MATERIAL. 
— ‘oun Structure. 
VIII.— UVinkaret Structure. 
rx Sha 08 be 
X.— Volcanic Stru 
XI.— Henry Mountain Diwked 
* 
Art. XLVIL—On the Ethers of Urte Acid. es aa ge 
the Chemical Laboratory of Harvard College ; by H. B 
Assistant Professor of Chemistry. 
ALTHOUGH the constitution of many of the derivatives a: 
uric acid may be said to be fairly coaat pitt the structure 0 
uric acid itself is still a matter of ae ade e. The for nue 
given ea Biyer,t Kolbe,t Strecker,§ Erlenmeyer,| Mul f. 
Hiifner,** Gibbs,t+ Medicus,tt Drechsel 88 +8 “Mallet rf ai 
* In great part from the 7 unpublished Proceedings of the Am. Acad., p. 26. 
Ann. Chem. u. Pharm jis 
Journ. Sig? mie em. Thi i, 1b "Berichte Deutsch. Chem. Gesellsch,, ii, 188 
Zeitschr. fiir Chem., 186 
Zeitschr. fiir Chem., sap, it. Miinchen. Acad. Ber., ii, 276. 
{{ Bericht. der Deutsch. Chem. Gesellsch., vi, 1237. 
** Journ. fiir prakt. Chem., II, iii, 23. 
Am. i, 289. 
4 , elxxv, 243. 
Journ. fiir prakt. Chem., Il, xi, 352. 
Am. Journ., oI, xi, 195 1876. 
