[41] Pliny, _Naturalis Historia_ xxiv. 12 and 68, xxv. 171.

[42] Marcellus, _De medicamentis_, ed. G. Helmreich (Leipsic, 1889),
preface, p. i.: "_Nec solum veteres medicinae artis auctores Latino
dumtaxat sermone perscriptos ... lectione scrutatus sum, sed etiam ab
agrestibus et plebeis remedia fortuita atque simplicia, quae
experimentis probaverant didici_." As to Marcellus and his work, see
Jacob Grimm, "Ueber Marcellus Burdigalensis," _Abhandlungen der
koniglichen Akademie der Wissenschaft zu Berlin_, 1847, pp. 429-460;
_id._, "Ueber die Marcellischen Formeln," _ibid._. 1855, pp. 50-68.

[43] Marcellus, _De medicamentis_, i. 68.

[44] Marcellus, _op. cit._ i. 76.

[45] Marcellus, _op. cit._ xxviii. 28 and 71, xxix. 35.

[46] Marcellus, _op. cit._ xxix. 51.

[47] Edward Westermarck, "Midsummer Customs in Morocco," _Folklore_,
xvi. (1905) pp. 32 _sq._; _id., Ceremonies and Beliefs connected with
Agriculture, certain Dates of the Solar Year, and the Weather in
Morocco_ (Helsingfors, 1913), pp. 75 _sq._

[48] E. Westermarck, "Midsummer Customs in Morocco," _Folk-lore_, xvi.
(1905) p. 35 _id., Ceremonies and Beliefs connected with Agriculture,
certain Dates of the Solar Year, and the Weather in Morocco_
(Helsingfors, 1913), pp. 88 _sq._