276 
SIR J. CONROY ON THE AMOUNT OF LIGHT REFLECTED 
Table XIII. —continued. 
Per cent, of 
Xi. 
(x - x{). 
Xc. 
{x — Xi). 
incident light 
transmitted. 
24-.3 mm. plate. 
June 15.—Cleaned, but not repolislied . 
84-7 
165-4 
92-4 
157-7 
87-40 
81-8 
165-3 
92-5 
157-6 
87-41 
84-9 
165-2 
93-9 
156-2 
85-49 
Mean 
86-90 
June 16.—Re-examined. 
86-7 
163-4 
95-6 
154-5 
85-75 
87-7 
162-4 
95-3 
154-8 
87-72 
88-0 
162-1 
95-9 
154-2 
87-29 
Mean 
86-92 
June 16.—Polisbed with rouge on silk . 
84-8 
165-3 
92-9 
157-2 
86-81 
85-5 
164-6 
93-3 
156-8 
87-30 
85-6 
164-5 
93-8 
156-3 
86-71 
Mean 
86-93 
June 2.3.—Repolislied by Mr. Hilger ; the 
84-6 
165-5 
94-6 
155-5 
84-03 
polish was defective 
84-4 
165-7 
94-3 
155-8 
84-15 
84-2 
165-9 
94-3 
155-8 
83-85 
84-1 
166-0 
94-2 
155-9 
83-85 
Mean 
83-97 
June 30.—Repolished a second time by Mr. 
85-5 
164-6 
92-9 
157-2 
87-90 
Hilger 
85-0 
164-5 
92-6 
157-5 
88-50 
84-6 
165-5 
92-5 
157-6 
87-09 
]\Iean 
87-84 
June 30.—Re-examined. 
86-4 
163-3 
94-0 
156-1 
87-86 
86-3 
163-8 
93-7 
156-4 
87-94 
86-7 
163-4 
94-3 
155-8 
87-67 
!Mean 
87-82 
July 17.—Re-examined. 
123-0 
1.38-7 
132-0 
129-7 
87-14 
123-7 
138-0 
132-4 
129-8 
87-88 
123-3 
138-4 
131-7 
130-0 
87-94 
87-65 
j\Iean 
