/ 
CONTENTS. Vv 
NUMBER CLIX. 
P 
Art. XXII.—Experimental Determination of Wave-Lengths 
in the Invisible Prismatic Spectrum; by 8S. P. Laneiey. 
weit © S00 Vijay ee oe ihe 169 
XXII.—The Quaternary Gravels of Northern Delaware and 
Eastern Maryland; by F. D. Cuxsrer. (With Map),.. 189 
XXIV.—On the identity of Scovillite with Rhabdophane ; 
y G. J. Bau te S. L. Ra ee Ma we eae 200° «, 
XXV.—The San Glo 5 DY tia Pe SARE oe 201 
XXVI. toe ke oo aiesinad Mises si Stoneham, Me. ; 
Bea Oe a ero heh ose we a Be eae te 12 
XXVIL. ~Contebatin to the bea of Rhode Island ; by 
ALE, (With a Map—Plate VI), ........._._. 17 
XXVIIL i ystalline Form of the supposed Herderite from 
Stoneham, Maine; by E. 8, Dawa, ........ 2.2. ..--.-- 9 
SCIENTIFIC INTELLIGENCE. 
Chemistry and Physics.—Relation between the Molecular row eh of ha i and 
mein t Velocity of Evaporation, SCHALL, 233.—Use of Nitrogen iodide in Pho- 
metry, Guya ARD: Production of Hydroxylamine from Nitric acid, 1 feast 234. 
—Oxidation of Phosphorus at low temperatures, CowPER and LEWES: Consti- 
tution of Benzene, KEKuLK, 235.—Observations on Phosphorescence, an: 
fa LA 
e, 
new phosphorescent eye-p BL, 236.—Karth Cur VIER, 
23 mn Bes periodically changing magnetic force, E. WARBURG 
d L. Hénie: Principles of Theoretical Chem rh with "Special reference . . 
to the Constitution of Chemi cal Compounds, I. Rems 
logy and Paes History.—Huma ni foot-peliiurc on kas near Munaqua, 
Nicaragua, G. H. Jonnson, ate 1 — Relat ive ages of certain River- a in 
incolnshire, A. x JUKE $-BRO 240.— . V. STEENSTRUP on the Glacier 
and Glacier-ice of North Euae mie Male esia, ODVARDO BeccartI: Thoughts 
upon Botanical Taxonomy, T. CarvEL, 241. —Necrologia Botanica, 242.—Dr. 
GEORGE aa AN, 244 
Astronom Mathematics.—Double Star observations made in 1879 and 1880 
in the 34-inch pahnter of the Dearborn har greta Chicago, 8. W. Burn- 
—Treatise on Projections, T. Crat 
‘aneous Scientific Intelligence. ip ie the Magnetic Declination 
the bs se ct im: agit Epoch January, }885, and Secular Variation of the : 
Magneti lina n the United States, etc., CHOTT, 245.—Maps > 
issued ce the sired Trane: Continental Survey, R. ‘PUMPELLY, 246, 
Obituary.— ARNOLD HENRY Guyor, 246 
