ever made by the British Plate-Glass Company, which are now at their warehouse in London:
| Height. | Breadth. | Price when silvered. | ||||
| Inches. 132 146 149 151 160 |
Inches. 84 81 84 83 80 |
£ s. d. 200 8 0 220 7 0 239 1 6 239 10 7 246 15 4 | ||||
| The prices of the largest glass in the Paris lists when silvered, and reduced to English measure, were, | ||||||
| Year. | Inches. | Inches. | Price when silvered. | |||
1825 1835 |
128 128 |
80 80 |
£ s. d. 629 12 0 136 19 0 | |||
(207.) If we wish to compare the value of any article at different periods of time, it is clear that neither any one substance, nor even the combination of all manufactured goods, can furnish us with an invariable unit by which to form our scale of estimation. Mr. Malthus has proposed for this purpose to consider a day's labour of an agricultural labourer, as the unit to which all value should be referred. Thus, if we wish to compare the value of twenty yards of broad cloth in Saxony at the present time, with that of the same kind and quantity of cloth fabricated in England two centuries ago, we must find the number of days' labour the cloth would have purchased in England at the time mentioned, and compare it with the number of days' labour which the same quantity of cloth will now purchase in Saxony. Agricultural labour appears to have been selected, because it exists in all countries, and employs a large
