[473] The continental evidence has been collected together in convenient shape by modern scholars: thus Mr. Stock, in his work on _Cæsar de bello Gallico_, notes and compares the evidence of Cæsar, Strabo, Diodorus Siculus, Ammianus Marcellinus, Mela, Lucan, and Pliny as it has been interpreted by modern scholars (see pp. 107-113), and he is followed by Mr. T. Rice Holmes in his study of _Cæsar's Conquest of Gaul_, pp. 532-536. The Druidic cult of belief in immortality, metempsychosis, ritual of the grove, augury, human sacrifice, is all set out and discussed. These are the continental Druidic beliefs and practices, and they may be compared with the Druidic Irish beliefs and practices in Eugene O'Curry's _Manners and Customs of the Ancient Irish_, lect. ix. and x. vol. ii. pp. 179-228, and Dr. Joyce's _Social History of Ancient Ireland_, i. 219-248, where "the points of agreement and difference between Irish and Gaulish Druids" are discussed. Mr. Elton notices the difference between the continental and the British Druids, but ascribes it to unequal development (_Origins of Eng. Hist._, 267-268). Cæsar's well-known account of the wickerwork sacrifice is very circumstantial. It is not repeated by either Diodorus or Strabo, who both refer to individual human sacrifice. Pliny introduces the mistletoe, oak, and serpent cults, and the other three authorities are apparently dependent upon their predecessors. [474] The mixture of Celt and Iberian is very ably dealt with by Mr. Holmes in his _Cæsar's Conquest of Gaul_, pp. 245-322, and by Ripley, _Races of Europe_, 461, 467, together with cap. vii. and xii.; see also Sergi, _Mediterranean Race_, cap. xii. [475] The intermarrying of the Picts with the Celts of the district they conquered is mentioned in all the chronicles as an important and significant rite, which determined the succession to the Pictish throne through the female side (Skene's _Chron. of the Picts and Scots_, 40, 45, 126, 319, 328, 329). Beda, i. cap. i., mentions female succession. Skene discusses this point in _Celtic Scotland_, i. 232-235, and McLennan includes it in his evidence from anthropological data (_Studies in Anc. Hist._, 99). [476] Mr. Seebohm is the best authority for the importance of the non-tribesman in Celtic law (_Tribal System in Wales_, 54-60).