316 SALMONIA. 



larger ones, which are in fact its reservoirs, 

 are the cause of this. The Grlindtl See fur- 

 nishes its principal stream, and this lake is 

 fed by two others — Tbplitz See and Lahngen 

 See; and the tributary streams which unite 

 at Aussee, from AUen Aussee and Oden See, 

 though one is blue and the other yellow, yet 

 combine to give a tint, which is nearly the 

 same as that from the stream of the Grlindtl 

 See, and which the river retains throughout 

 its course. Yet I have seen even this river 

 very foul, but only in a part of its course, 

 below Ischel. I was once at that place, 

 when the thunder storm of a night having 

 washed the dust of the roads into the river, 

 it was extremely turbid from Ischel to the 

 Traun See. It rendered the upper part of 

 this large lake coloured ; but, notwithstand- 

 ing this, the river came from the lower part 

 of it perfectly clear, and I caught fish in it 

 there with a fly, which at its entrance into 

 the lake was quite impossible. 



PoiET. — You, Halieus, must certainly 

 have considered the causes which produce 

 the colours of water. The streams of our 

 own island are of a very different colour from 



