THE PEE-HISTOEIC REMAINS OF BEITTANY. 
187 
revetments or boundary walls of large upright stones. Where such 
tumuli have disappeared these stones would remain as circles. The 
avenues Captain Oliver regarded as approaches of a ceremonial 
character connected with funeral rites, not necessarily only those 
which preceded interment, but for subsequent visitations. In like 
manner he considered that the elaborate sculpture found in the 
interior passages and chambers of some of the dolmens indicated 
that it was intended they should be opened and entered occasionally. 
These views the lecturer strengthened by a reference to customs 
existing in China. The lecture contained several allusions to the 
labours of Mr. Spence Bate for the elucidation of the pre-historic 
archaeology of Dartmoor, and was illustratad by a number of 
admirable sketches and plans by Captain Oliver, and by some 
excellent models of dolmens, kistvaens, and tumuli, the work of 
Mr. Bate. 
