GILLAROO. 63 



stomach of the same kind with the gillaroo, 

 but not quite so thick, and which feeds at the 

 bottom in the same way. I have often looked 

 in the lakes abroad for gillaroo trout, and 

 never found one. In a small lake at the foot 

 of the Crest of the Brenner, above 4000 feet 

 above the level of the sea, I once caught some 

 trout, which, from their thickness and red 

 spots, I suspected were gillaroo, but on open- 

 ing the stomach I found I was mistaken; it 

 had no particular thickness, and was filled 

 with grashoppers : but there were char, which 

 fed on shellrfish, in the same lake. 



POIET. Are water-flies found onallrivers? 



HAL. This is a question which I find it 

 impossible to answer ; yet from my own ex- 

 perience I should suppose, that in all the 

 habitable parts of the globe certain water-flies 

 exist wherever there is running water. Even 

 in the most ardent temperature, gnats and 

 musquitoes are found, which lay their con- 

 geries of eggs on the water, which, when 

 hatched, become first worms, afterwards small 

 shrimp-like aurelia, and lastly flies. There 

 are a great number of the largest species of 



