CONTENTS OF VOLUME Xx. 
if 
NUMBER I. 
Page. 
Arr. I, On the means of Sarge in Steam teat by i L. SuL- 
Livan, Civil Engineer, 
ll. Specification of an improvement in steam eugine better; 
or the employment of caxburotied hydrogen wad as 
some oe: on the ans bases Quinia and Cincho- 
; byG E W. Carpe - - - 
VI. Kialpe a iis, De togea of “Reibuitz: by Prof. E 
ITCHELL, of the University of North Caroli ina, - 
VII. On Central F orces; by Prof. Turopore Strong, - 
VIII On the Transition Rocks of the Cataraqui; by Cap. R. 
U 
Lae hare R. E. Up. Can., with Figures 
the pla . 
IX. Notice pee the Garden of Fromont, translated 
rom the French; by JAacoB ota 3 M D. " 
X. Chemical Works, = 
XI. Art de se preserver de ‘Piténn de % Flame? par rM. Le 
alier Atpin1.—The art of preserving from the 
action = flame; by ex! Ch. — Analysis by a 
J. Grr 
XII. Geslogical Com mmunication 
. Crotalus? reliquus, or Arnie’ crotaloides, 
4 The Gold of Mexico in a roc , equivalent to that 
which —— the Gold of the seabed by a i 
Amos Ear 
3. Seratches on ee in the Al leghatiy range ; by 
m A. Tuompson, of Sullivan oe N. 
XIII. Meteorological Oliasr vit cis, ee hyn. oF. Hu- 
, at: Marietta, (Ohio) i 
0 
XIV. a: a \ ingulae instance of? rytallization by Avcusrvs ; 
A 
XV. Ona ae of climate - - = " 
XVI. Fuel for Steam Boilers. —Eorr 
XVII. On the electro-magnetic propastine at metaliforous v veins 
ne mines of oe by —_ ERT bas 
outh, 
XVIII. sila icsetsadncas oe - - - . ~ 
