ANNUAL ADDRESS OF THE PRESIDENT. LXXV 
only to compare the resulting systems of corrections with those found 
by Mr. Chisholm in 1873. Table I shows that according to Mr. 
Harris’ weighings all the weights have grown lighter during the in- 
terval from 1758 to 1873, while Table II shows that according to 
Mr. Freeman’s weighings some have grown lighter and others heavier, 
and that by quantities which cannot be attributed to accidental 
errors in the weighings. In view of these facts there cannot be a 
doubt that the Committee of 1758 was right in using only Mr. 
Harris’ weighings, and it seems equally certain that the numbers in 
Table I should be adopted to the exclusion of those in Table II. 
TaBLE II.—Corrections to the Exchequer Standard Troy Weights of 1588, 
derived from the Weighings made by Messrs. Freeman and Chisholm. 
Denomination Apparent | Committee’s Corrections given by 
of correction | correction Mr. Chisholm 
Weight. in 1758. in 1758 in 1758. in 1873. 
Grains. Grains. Grains. Grains. 
$ ounce solid ____- — 0-01 — 0°03 0-0 — 0:06 
4 ounce hollow ---| + 0°49 + 0-47 + 05. + 0:40 
2 ounce 2.2 a — 0-08 — 0-06 ‘0 — 0-21 
2 OUNCE Sin 502% 05 Tii! ‘0 36 
ronmour 2 os82 oo. “lt 23 0-0 0-45 
2 ounces 2. — 0-21 46 — 10 1:01 
4 ounces ~---_--~_-_ + 0:08 42 0-5 0:68 
Siounces) 22023225 16 0-83 0-75 — 1:09 
16 ounces --------- + 0-31 1:68 1-75 3°84 
Sa Ounces 2... =.= — 1°38 5°36 5:5 3°82 
G4, ounces) 222) == — 0°75 BG ate. ioe — 5:04 
128) ounces" 222 + 13-50 2-40 + 30 + 4:28 
ZD0).OUNCES = 225s — 12-00 — 43°81 — 45:0 — 53°58 
EAS aes at + 0-00 -— 63°62 — 61:0 — 65°46 
