438 



MR. J. B. SUTTON ON HYPERTROPHY. 



[May 5, 



a rounded form instead of presenting the usual broad fan-sliaped 

 aspect. The ahnormal condition of the extremities of the rays 

 may aifect otlier fins besides the caudal (fig. 6). 



The lake in question is about 1000 feet above the level of the sea. 



The hard parts of the caudal extremity of tlie Trout. The upper figure (a) shows 

 the abnormal condition of the extremities of the rays in the so-called 

 tailless Trout of Islay (Lochnamorachan Trout), after Traquair. The 

 lower figure (i) shows the normal condition ; it is inserted for comparison. 



It is about an acre in extent, and so shallow that a man can wade 

 through it : the bottom is of quartz rock. Several other lochs near 

 contain Trout, but none are " tailless." So constant is this ab- 

 normality in Trout taken from the lake in question that one keen 



