1G4 PROCEEDINGS OP THE ACADEMY OP 



On being placed in water at 52 the ova immediately commenced 

 hatching, and in a week the fry were all out. In seven weeks the 

 yolk sac was absorbed, and the} r commenced feeding off small 

 particles of curdled milk fed to them daily for a week longer. 

 They were then transported in large tin vessels to the Buskill, 

 which runs through the outskirts of Easton, where a third of 

 them were liberated at the mouth of a cold spring branch, and the 

 remaining two-thirds placed in a small natural pond fed by a 

 copious spring in a meadow above and discharging by a narrow 

 outlet into the creek. Either here or at the mouth of the spring 

 branch mentioned the fry will get such natural food as their in- 

 stinct will lead them to seek, and thrive far better than if kept in 

 artificial ponds and fed on prepared food. 



The law of the salmon, as with the shad and other anadromous 

 fishes, is that it will inevitably seek its native stream in its return 

 from sea impelled by the instinct of reproduction, and although 

 the Delaware is south of the limit of the geographical range of the 

 salmon, it is on the law of nature that reliance is placed for its 

 return to this river. It has been ascertained beyond doubt that 

 one-half of a brood of salmon go to sea when a little over a }'ear 

 old, and the remaining half the following summer. The males of 

 salmon as with shad are fecund a year earlier than the females, and 

 it is not improbable therefore that those that migrate when a year 

 old are males, and those that go to sea the next year are females. 

 Mr. Norris thought the Delaware, on account of its being unob- 

 structed by impassable dams and having a bold .current, was a 

 favorable river for trying to acclimatize salmon south of their 

 present habitat. He is sanguine of success, and, even if the solu- 

 tion of this problem should not be favorable, he considers it im- 

 portant that the question should be definitely settled. 



Mr. Norris also made some remarks on the effect of food on the 

 external appearance of trout (S. fontinalis), as well as on the 

 quality of their flesh that, when fed in crowded artificial ponds 

 on prepared food, the vermilion spots disappear, and the flesh 

 deteriorates, but that the spots are restored, as well as the flavor of 

 the fish, when placed in large ponds where they can find natural 

 food. He also spoke of the malformation of young trout and 

 salmon on being hatched, the body being curved around the yolk- 

 sac, causing their death in a few weeks. 



July 9. 

 The President, Dr. Ruschenberger, in the chair. 

 Thirteen members present. 



On Artemiafrom Salt Lake, Utah. Prof. Leidy directed atten- 

 tion to a bottle containing numerous specimens of a minute crus- 



