them had white spots on the shells, and there were a dozen or so of 

 glassy, opaque ones. From these eggs 1,450 spotted-sac fry were 

 hatched, and of these about 600 were reared to the yearling stage. 

 The two female breeders did not develop eggs again until two years 

 later, but we had no difficulty in getting out these eggs, although 

 they were not much better in quality than at first. We had about 

 200 of these second generation fish left when the first female developed 

 eggs in the fall of 1908. This illustrates the small percentage of 

 females that reach sexual maturity in their fifth year, for the other 

 females of this lot of 200 fish did not spawn until the following fall 

 — 5^ years after hatching. This one, poor, lonely female was 

 given a good deal of attention, for much of the success or failure 

 of the entire undertaking would be indicated by her deliverance and 

 the condition of the eggs. When the time arrived for the eggs to 

 come out, the writer was very much discouraged to find that they 

 could not be taken with any more freedom than had been experi- 

 enced with her progenitor almost five years before. The eggs 

 though, were much better in quality, color, and percentage of fer- 

 tilization ; and the resulting fry showed greater vitality and more 

 rapid growth. When the remaining females of this lot of fish ripened 

 the following fall, results were more satisfactory, for from among 

 the 36 females that had eggs in them, we were able to strip four 

 without the use of the dropper, although more force than is usually 

 applied was necessary. 



This is perhaps a good place to mention the interesting fact that 

 with none of the hundreds of females that we had operated upon, 

 was it ever found necessary to dilate the ovipore a second time. 

 With the stripping of the third generation of fish in the fall of 

 1913 and of 1914 this difficulty of a constricted ovipore seemed 

 overcome at last, and with the fourth generation of breeding fish 

 in 1918 and 1919 it had entirely disappeared. Why such a physical 

 abnormalty should exist even with salmon reared under artificial 

 conditions, the writer has never been able to understand, for it is 

 not found among the domesticated breeders of other Salmonidae. 

 We all have had experience with examples of plugged fish, but 

 this condition was entirely different. Many fish with well-developed 

 eggs were sacrificed in an effort to discover by careful dissection 

 the existence of a false membrane stretched across the internal duct; 

 but nothing of a hymenal character could be discovered. It may 

 be that the development of the eggs under artificial feeding in the 

 fish of the earlier generations, was proportionately more rapid than 

 the general development of the rest of the body, for while the sal- 



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