34 ROMAN POTTERY FOUND IN BRITAIN. 
11. Pear-shaped Bulgy Olla, with small, straight, obliquely 
inclined rim, divided from the shoulder by a shallow groove. 
(See Rim Section, type 3). 
Light brick-red coarse clay (unglazed). 
Height 5§ ins., diams. of rim 5 ins., bulge 5 % ins., base 2;) ins. 
Proportions, 88 : 117 : 46. Margins, 43 : 56. 
The form and proportions are those of similar vessels during the 
second-half of the I. Century. 
12. Cinerary Urn (containing burnt bones), lightly scored round 
the body with latticed lines, recurved rim. (See Rim Sec¬ 
tion, type 1). 
Fumed light-grey clay. 
Proportions, 70 : 85 : 40. Margins, 20 : 36. 
Corresponding with those of middle of the II. Century, in Table IX., and 
those of a Cinerary Urn discovered in the filling of the ditch of the early camp 
at Newstead (Curie, Op. cit. p. 19, plate IV., 1), belonging to the Antonine 
period (a.d. 140—180), the directly measured dimensions of which are—Height 
9f ins., diams. of rim 6 ins., bulge 7-J ins., base 3f ins. Proportions, 65: 78 : 40. 
Margins, 16 : 31. 
13. Tall ovoid Olla. Rim straight, obliquely inclined, and 
thickening upwards to a narrow inside ledge for a lid. Under 
base slightly domed inwards. (See Rim Section, type 3). 
Fumed light-grey sandy clay. 
Height 844 ms., diams. of rim 5^ ins., bulge 6J ins., base 3 T yins. 
Proportions, 64 : 72: 35. Margins, 11 : 31. 
The marginal proportions of an olla can be obtained by placing 
a set-square vertically against its side, and a straight edge (decimal 
or metrical scale, or 2 foot rule) across its rim and measuring 
decimally or metrically— 
(a) The vertical distances from the top and bottom to its 
greatest diameter at the point where the upright touches (near the 
middle); (b) the horizontal distances from rim and base to the 
upright. 
The percentage proportions of (a) the verticals, to (b) the 
horizontals (easily worked on a slide-rule), are the marginal pro¬ 
portions required. 
In two columns on the right of the tables, a series of what 
have been termed marginal proportions are inserted as still more 
useful and striking evidence, based on the gradual flattening of 
the bulge, for determining the relative dates of ollae. They are 
derived from measurements of the varying amounts of inbending 
from the widest part upwards and downwards on one side only 
of the vessel, and can be obtained from large fragments which 
retain an) 7 of the widest part, near the middle, and enough of the 
rim or base for them to stand upright on a level surfaee. 
