1919.] 
New Zealand Institute Science Congress. 
303 
glazed pieces were tested together, and subsequently the ten more or less 
unglazed pieces. 
TEST No. 1.—TEN GLAZED PIECES. 
Average pressure, 2,0001b. per square inch (maximum, 2,1001b.; 
minimum, 1,950 lb.), maintained for fifty hours. 
Shipment 1 . 
Specimen. 
Weight dry. 
Grammes. 
Density. 
Increase 
in Weight. 
Grammes. 
A 
. . 52-862 
2-337 
•006 
B 
. . 61-367 
2-324 
•012 
C .. 
. . 51-688 ' 
2-325 
•004 
D 
. . 47-155 
2-342 
•006 
E 
. . 39-630 
2-341 
•007 
Shipment 2. 
A .. 
. . 37-786 
2-244 
•005 
B 
. . 45-770 
2-231 
•009 
C .. 
.. 44-242 
2-232 
•006 
D 
. . 43-774 
2-243 
•010 
E 
.. 37-738 
2-266 
•009 
These ten specimens were all subsequently broken in 
case did the fracture show any sign of colour. 
half, and* in 
TEST No. 2 -—UNGLAZED PIECES. 
The rest of the specimens from these two shipments were weighed, 
their densities were determined, and they were subjected similarly to 
immersion for fifty hours in fuchsin solution on which an average pressure 
of 2,050 lb. per square inch was maintained. These specimens were from 
the crown of the second shells, mostly totally unglazed on both sides. In 
some cases there was a small patch of glazing on one side. 
Specimen. 
I 
Gr 
J 
H 
i 
K 
F 
G 
H 
I 
J 
Shipment i. 
Weight dry. 
Grammes. 
Density. 
Increase’ in 
Weight. 
Grammes. 
. 54-873 
2-355 
•016 
. 30-647 
2-355 
•007 
. 50962 
2-354 
•016 
. 48-526 
2-355 
•021 
. 54-579 
2-355 
•020 
Shipment 2. 
. 51-051 
2-294 
•002 
. 65-335 
2-288 
•022 
. 70-039 
2-283 
•020 
. 60-863 
2-283 
•013 
. 32-644 
2-327 
•004 
of shipment 1 
and H of 
shipment 2-showed 
e on being broken later. 
H of shipment 1 
