CONTENTS. 
Treatise on Statics, by Gasparp MoncE 448.—Rainey’s Improved Abacus 
Lichenes Americe Septentrionalis Ciclecsti, curante Epvarpo TUcKE RMAN, 
.M.: The Old Red Sandstone or New Walks in an Old Field, Sg Ho 
Miter, 449 
List of Bathe 449. 
Index, 451. 
Plate I, Magnetic Telegraph—to illustrate Articles VI. and XVI. 
Plate II, to illustrate Art. XIX, On Whirlwinds, p. 181. 
ERRATA. 
18, 1. 16 from bottom, for “ space,” read “sphere,” P. 22,1. 5 from top, sub- 
stitute Sf for f. P. 23, 1.13 from Bee 2 ‘any portion of egrs,’ read “ any 
uae oars” P. 24,1. 15 from ‘oP. for 
P 
a ap read inde? Page 33, line 8 
- a “9 a2Q’ 
os from bottom, for nKR? read 2rKR?. P. 34, 1.4 from top, for 
e. 3 97, 9th |. from bottom, for Lagostoma nodosa, read tae perlatus 
ae -P. 108. 1. 12 oe ~— ono.” anilene,”’ Bere “ eet * P. 110, lin 
a m, for Ose +4H d = HO.” —¥; en i 0x2 
0! O4 read * uk il 19 from, 
bottom, for * mete read ‘ urethan es 
