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CONTENTS OF VOLUME XXXIII. 
NUMBER XCVII. 
re 
Art. I. Thirty Years Retrospect of the progress in our knowl- 
edge of the Geology of the Older Rocks—an Address to 
the Geol. Sec. of the Brit. Assoc.; by Sir RopEricx Impey 
Morcuison, D.C.L., LL.D., F.R.S., etc., - - - 
Il. The Heather (Calluna soca a Native of the U. Sites 
by Epwarp S. Rano, Jr., : 
Ill. Waterglass—Part III; by ‘Soiit M. Ghia: . 
IV. On the Unity of Sree Phenomena in the Solar System : 
by L. Samann, - 
V. Berberin in Hydrastis Acdeusa: ‘ "2 x; aes Ph. D., - 
VI. Remarks on the Age of the so-called “ Leclare Limestone” 
and * Onondaga poe tie of the lowa ee us, A. Oe 
WorTHEN, 
VIL. The Gorilla; by’ Lomas Js oon, ML. D.; 
VIII. On the investigation of Microscopic forms by means of. the 
Images which they furnish of external objects, with some 
practical applications; by Prof.O.N. Roop, - — - ‘act 
IX. The Primordial Sandstone of the Rocky Monntains in the 
Northwestern Territories of the United States; by Dr. F. V. 
Haypben, - - 
X. On the Hinctioes of Bihylamin dnd Diethylamine by 
M. Carey Lea, 
XI. On Nitrate of ee by M. kee eet 
XIL The Distinguishing Features of Comets seasas as <ul 
of an Electrical Discharge sores from re-send of 
Orbit ; by Bens. riage MarsH, - 
XII. Further observations on the age of the Red Sandrock for. 
mation (Potsdam group) of Canada and Vermont; = E. 
Briiines, F.G.S., ete., - 
XIV. Letter from Sir Wm. E. PeeIK on Sir R a Mureiianale 
gab to the determination of the = of the Quebec 
XV. 0m from Jie iss, Bay: -» on a Neieians asides 
and Hudson River Rocks in Vermont, - 3 
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