THE WORLD'S COLUMBIAN EXPOSITION. 181 



The salt water was a saturated solution, and was manufactured from 

 time to time as needed. This water was circulated by means of two 

 pumps driven by water pressure, the pumps lifting the water from the 

 storage tanks below the floor, into which the troughs and other forms 

 of apparatus emptied, into the tanks overhead, from which the water 

 was furnished by gravity to the hatching apparatus. 



Eggs of various kinds were hatched during the months of May, June, 

 parts of July and September, and all of October. At the opening of 

 the exhibition, May 1, there were in the hatchery 800,000 shad eggs, 

 3,000,000 pike-perch, and 84,000 yellow-perch, and by the end of June 

 10,550,000 pike-perch eggs, 700,000 yellow-perch, 800,000 shad, and 

 154,000 eggs of the common sucker had been received and cared for 

 and 0,900,000 fry hatched. Of these 3,700,000 pike-perch fry, 700,000 

 yellow-perch, and 100,000 suckers were planted in Lake Michigan near 

 Jaekson Tark. 



The shad eggs were all lost on account of the extremely low tempera- 

 ture of the water (average 42° F.), though some of them showed signs 

 of life as late as May 13. 



On June 29, 20,000 black-spotted trout eggs were received from Lead- 

 ville and placed on the wire trays and in the gravel trough. The tem- 

 perature of the water at that time was 04°, and the eggs commenced 

 hatching two days after they arrived. By July 9 they were all hatched, 

 with a loss of about 8,000. The fry commenced feeding on July 14, 

 and were carried with fair success in our troughs, notwithstanding the 

 high temperature of the water, until, owing to an accident to the 

 machinery, the Exposition Company was compelled to shut off the 

 water, which killed most of the fry on hand. 



Arrangements had been made for obtaining the supply of quinnat- 

 salmon eggs from California, and on September 23 a package contain- 

 ing 50,000 was received in good condition. These were placed in the 

 Stone salmon baskets and Atkius trough, and were all hatched by 

 October 7, with a loss of about 29,000. The fry were successfully car- 

 ried in our rearing troughs until the close of the Exposition, when 

 19,000, the balance on hand, were shipped by one of the Fish Com- 

 mission cars to Xorthville, Mich. A consignment of 54,000 lake-trout 

 eggs, from Alpena, was received on October 9, and another of 40,000 

 quinnat-salmon eggs was received on the 19th of the same month from 

 Clackamas. This latter package arrived in first-class condition. These 

 eggs were placed in the hatching troughs, where they remained until 

 the close of the Exposition, when they were shipped to Mr. Frank "N". 

 Clark at the jSTorthville station. In addition to the hatching opera- 

 tions, several thousand trout furnished from the Xorthville station 

 were cared for in our rearing troughs during the summer in the Gov- 

 ernment building. 



