[2841] “Blood-red” glass.
[2842] See B. xxxvii. cc. [7], [8], [11]. This glass was probably of an opal colour, like porcelain.
[2843] This passage is commented upon by Beckmann, Vol. II. p. 75, in connexion with a similar passage in Isidorus, Orig., which is probably corrupt.
[2844] See B. xxxvii. c. [10]. He was not aware, apparently, that in such case they act as convex burning-glasses, and that ice even may be similarly employed.
[2845] This is, probably, the meaning of “in guttas;” a new reading, which is only found in the Bamberg MS.
[2848] “Improba” seems to be used here in much the some sense in which Virgil has said “Labor improbus”—“Unremitting labour.”
[2849] He alludes, probably, to eclipses of the sun.
[2850] Acacia charcoal is still recommended as a valuable tonic, and as good for internal ulcerations and irritations of the mucous membrane.