[Footnote 20: Anna Comnena has partly drawn aside the
curtain. (Alexiad. l. xiii. p. 383.) Elsewhere (l. xi. p.
336) she mentions the property of burning. Leo, in the xixth
chapter of his Tactics, (Opera Meursii, tom. vi. p. 843,
edit. Lami, Florent. 1745,) speaks of the new invention.
These are genuine and Imperial testimonies.]