The official returns for the Bavarian fisheries, dating from the latter part of the sixteenth century, were examined by Von Hessling in 1858. He noted many gaps in the statements of the yearly returns, partly on account of the loss of the records and partly because the pearls were delivered directly into the hands of the princes. The results of the first fisheries are recorded in the district of Hals for the years 1581–99, in Viechtach for 1581–83 and 1590–93, and in Weissenstadt and Zwiesel for 1583. The range of the fisheries was enlarged through the discovery of new areas during the first half of the seventeenth century; but this was offset by the bad seasons and by disturbed conditions during the Thirty Years’ War. From 1650 to 1783 the pearls in the forest lands of the Palatinate were exploited regularly and uninterruptedly, with the exception of the district of Wetterfeld and that of Neunburg vor dem Wald, where they were prosecuted for a few years only. From 1783 to 1814, they were almost entirely neglected, and the take was confined to a few streams in Upper Palatinate and in the Bavarian forests. In the former episcopal principality of Passau, where, according to general accounts, the waters were rich in pearls, the records were scanty previous to 1786; this was probably owing to the fact that the head gamekeeper was obliged to transmit the catch of pearls directly to the prince-bishop. The records for the fisheries in the districts of Rehau and Kulmbach began with the year 1733. From these fragmentary returns—making no estimate for the years for which there were no figures available—Von Hessling found that from 1600 to 1857 there were taken 15,326 pearls of the first class, which were clear white in color and of good luster; 27,662 pearls of the second class, which were somewhat deficient in luster, and 251,778 pearls of the third or poorest class, or “_Sandperlen_,” which, though of poor quality, had sufficient whiteness and luster to be used as ornaments. Had the records been complete, these figures would probably have been at least fifty per cent. greater, or a total of about 445,000 pearls in the 257 years. In the last forty-three years of this period, for which the records are fairly complete, the annual average was 208 pearls of the first, 395 of the second, and 3091 of the third class, a total each year of 3694 pearls of all grades. This was divided among the districts as follows: ANNUAL AVERAGE District First class Second class Third class Total Upper Franconia 13 34 52 99 Upper Palatinate 38 77 207 322 Lower Bavaria 157 284 2832 3273 ——— ——— ———— ———— Total 208 395 3091 3694