On Stocking. 13 



stream ; others thrive better if the water falls into 

 the pond over a perpendicular inlet. Char live in 

 deep -shaded ponds, narrow and constructed east 

 and west, so that the south side gives shade at 

 all times, while they die only too freely if the 

 pond runs north and south, and is difficient in 

 shade. We have found S.fontinalis thrive, how- 

 ever, in a deep, narrow pond, with perpendicular 

 sides running north and south, this pond is well 

 shaded by overhanging trees ; while in two similar 

 ponds, not so shaded, the loss both in spring and 

 after spawning is very heavy. 



The production of Ova also includes the intro- 

 duction of fresh blood and the production of 

 fertile crosses. There are now at Howietoun 

 many thousand yearlings whose pedigree shows 

 one-eighth salmon blood and seven-eighths trout 

 blood. And we have reason to believe that this 

 cross will prove perfectly fertile inter se although 

 the higher proportions of salmon blood have been 

 very largely infertile ; but this subject will be 

 more fully recorded and discussed in the second 

 part of the history of Howietoun. 



THE INCUBATION OF OVA. The strength of the 

 fry is controlled by the mode of incubation of the 

 Ova. The best Ova from the best strain of trout 

 may easily be so treated that the resulting fry are 

 puny and ill-conditioned ne'er-do-weels. There 



