Notwithstanding considerable confusion in Pliny's account of this substance, our belief is, that it refers to different salts of alumina, and whether or not they were all used in the processes of dyeing, they were used for manufacturing purposes, and thus gives us some insight to the advanced state of the arts in those times. Respecting the cost and durability of the Tyrian purple, it is related that Alexander the Great found in the treasury of the Persian monarch 5,000 quintals of Hermione purple of great beauty, and 180 years old, and that it was worth $125 of our money per pound weight. The price of dyeing a pound of wool in the time of Augustus is given by Pliny, and this price is equal to about $160 of our money. It is probable that his remarks refer to some particular tint or quality of color easily distinguished, although not at all clearly defined by Pliny. He mentions a sort of purple, or hyacinth, which was worth, in the time of Julius Cæsar, 100 denarii (about $15 of our money) per pound. Since, according to our modern researches into this dye, one fish, the common _Purpura lapillus_, produces only about one drop of the liquor, then it would take about 10,000 fish to dye 1 lb. of wool, so that $160 is not extravagant. Spinning and weaving in ancient times were principally performed by women; indeed, the words _woof_, _weaving_, and _web_ are allied to the word _wife_. However, in ancient Egypt and in India men also wrought at the loom. Probably nothing could be simpler or ruder than the looms used by ancient weavers. Were we to compare these with the looms and other weaving apparatus of the present day, and reason therefrom that as the loom so must have been the cloth produced thereon, we would make a very great mistake. There are few arts which illustrate with equal force our argument in favor of the perfection of ancient art so well as this of weaving. It would appear that our advancement is not so much in the direction of quality as in that of quantity. There are few things we can do which were not done by the ancients equally perfect. Rude as were their looms in ancient Egypt, they produced the far-famed linen so often mentioned in Scripture and the writings of other nations. In order to show that this is not to be regarded as a merely comparative term applicable to a former age, we will here quote from G. Wilkinson respecting some mummy-cloths examined by the late Mr. Thomson, of Clithero:--"My first impression on seeing these cloths was, that the first kinds were muslins, and of Indian manufacture; but this suspicion of their being cotton was soon removed by the microscope. Some were thin and transparent, and of delicate texture, and the finest had 140 threads to the inch in the warp." Some cloth Mr. Wilkinson found in Thebes had 152 threads to the inch in the warp, but this is coarse when compared with a piece of linen cloth found in Memphis, which had 540 threads to the inch of the warp.