ERRATA. 
Page 48, line 14, for “ a rampart,” read “ ramparts.” 
a 49, line 15, for “owing to the nature of the ground and the disposition of the siege works, not 
be .tied down,” substitute “ not be tied down by the nature of the ground and the dis¬ 
position of the siege works.” 
n. 62, last paragraph of part 2, for “little,” read “ no.” 
a 65, line 4 ,for “ trajectory pencil,” read “ set of trajectories.” 
a 66, part 5, first paragraph ( not the heading), omit “ curved.” 
a 67, part 6, line 7, after “are,” insert “ therefore,” and after “ when.” insert “ necessary, as 
when.” 
ii 68, lines 10 and 11 from foot, for “ trajectory pencil,” read “ set of trajectories.” 
ii 59, line 3, same correction as the last, and for “ deepest,” read “lowest.” 
ii 59, line 25, after “lateral,” insert “and longitudinal.” 
/, 60, line 19 ,for “ angles,” read “-angle,” and for “ are,” read “ is.” 
ii 61, line 7, for “ may,” in second place, read “ would.” 
ii 64, last line, for “ for,” read “ by.” 
ii 69, line 12 from foot, for “ rebound,” read “ glance.” 
ii 73, line 27, omit “ resulting.” 
ii 74, line 11,for “circumstances,” read “conditions.” 
