Unios from the upper part of the Mississippi yield a much greater percentage than those from below Davenport. In 1904, for instance, from the 4331 tons of shells taken in Wisconsin the fishermen secured pearls which they sold for $91,345, an average of $21 per ton; from the 822 tons in Minnesota the average was $16 per ton; in Iowa the average was $12 for each of the 7846 tons; in Illinois, $5 per ton for the 2364 tons, and in Missouri less than $1 worth of pearls was secured by the fishermen for each ton of shells which they took in the year named. A large number of choice pearls weighing over thirty grains each were found in the vicinity of Prairie du Chien and McGregor. Within a river length of one hundred miles in that region, the fishermen in 1904 gathered pearls which ultimately sold for $300,000. It is therefore apparent that the returns vary greatly in the different regions; nevertheless, even in the less productive localities fine pearls are sometimes found, which contribute to make the industry a profitable one. Success in pearling is like that in mining. In the White River in Arkansas, for instance, one man found $4200 worth in one month. Another discovered a $50 pearl in the first shell he opened. A Negro found an $85 pearl the first day he worked, while another fisherman worked seven months and secured less than $10 worth. It is a question of finding or not finding; the finding brings riches sometimes, and though the failures reduce the average profits as low as in other local ventures, the big prizes affect the mind, and the average is lost to sight. Taking the country as a whole, it is probable that the total find has been sufficient to pay the average fisherman little if any more than $1 for each day’s work. The fresh-water pearls range in size from that of the smallest seed to that of a pearl weighing several hundred grains. There is relatively only a small quantity of seed-pearls, especially when compared with the output in the fisheries of Ceylon and Persia. Possibly this is due largely to a scarcity of the parasites which seem to perform so important a function in the regions noted. A further reason may be found in the manner in which the mollusks are opened and searched. Were the Ceylon method of opening employed here—which, however, is not at all practicable—it seems probable that the quantity of seed-pearls found in this country would be greatly increased.