116 ANATOMY OF THE DIGESTIVE TRACT IN THE SALMON. 



more prolonged and extensive observations. I regret that at the 

 time these were made it was impossible to fix the viscera of the 

 upper water fish at the river-side ; and the question can only be 

 definitely settled by making a series of examinations in this way, 

 first of estuary fish, then of fish from the upper waters of long 

 rivers, and lastly of kelts. 



