56 ARBOR LOW EXCAVATIONS IN I9OI AND I9O2. 



Considerable traces of fire were observed at the bottom of 

 this cutting, especially in the south-east corner, indicated by 

 a dark patch near the bottom of the photograph, plate III. 

 Dr. Garson has suggested that the traces of fire at this point 

 may possibly indicate that this portion of the ditch, which 

 is deep here, and therefore sheltered from winds, was occupied 

 by persons employed in guarding the circle ; hence the greater 

 number of implements in this section and the corresponding 

 section, No. 2, on the other side of the north-north-west 

 causeway. 



The completion of the excavation of the Ditch Extensions 

 of Sections 2 and 4 enabled me to determine the minimum 

 width of the northern causeway as 29 feet (8-84 m.). This 

 causeway is partly shown on the left-hand side of the photo- 

 graph, plate VII. The southern causeway is well shown in 

 plate I. 



This completed the examination of the fosse, 85 feet 

 (26 m.) having been excavated in all, of the total length 

 of 540 feet (165 m.). In other words, nearly one-sixth of 

 the fosse has been re-excavated, flint implements only having 

 been found from top to bottom of the silting. The mean 

 depth of the whole fosse excavated is 3-9 feet (1-18 m.), and 

 the average width at top 22 feet (6-7 m.). 



As regards the arrow-heads, it is worthy of notice that the 

 barbed and tanged specimen (plate VI., No. 43), a form 

 generally considered to be the most highly developed, was 

 found 27 feet (82 cm.) lower down in the silting than the 

 arrow-head of leaf-shaped form, but approximating closely to 

 the lozenge-shaped, a form which is generally regarded as an 

 earlier form than the barbed variety (plate VI., No. 29). It 

 has not, however, yet been clearly ascertained which form of 

 arrow-head was first manufactured, and the matter is at present 

 surrounded with some difficulty, inasmuch as the triangular, 

 stemmed, and leaf-shaped varieties have been placed on record 

 as being found together in the same locality and the same 

 deposits. One form is easily evolved from another, and 



