Nissen, _Italische Landeskunde_, i.p.324, has collected the records of these floods.] [Footnote 10: See Nissen, i.p.407.But it seems likely that the Tiber valley was less malarious then than now (see Nissen's chapter on malaria in Italy, p.

410 foll.).

In an interesting paper on _Malaria and History_, by Mr.W.H.S.

Jones (Liverpool University Press), which reached me after this chapter was written, the author is inclined to attribute the ethical and physical degeneracy of the Romans of the Empire partly to this cause.] [Footnote 11: Livy v.

54.] [Footnote 12: Horace, _Epode_ 16.] [Footnote 13: _Reden und Aufsaetze_, p.