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472 MR. JOHN BALL ON THE 



Chubat and the Senger, and the only river deserving that title 

 is the Rio Negro, whose mouth lies about lat. 41° S. This is 

 formed by the junction of two streams that are fed by the snows 

 of the Andean range. The Limay, rising about lat. 43°, receives 

 numerous torrents from the main chain, and flows north-east- 

 ward nearly parallel to it for more than 250 miles, until it meets 

 the Neuquen, flowing in the opposite direction after draining 

 the eastern flanks of the great range for a considerable distance. 

 From their junction the united streams, under the name Bio 

 Negro, flow somewhat south of east to the Atlantic. Another 

 considerable stream — the Rio Colorado — rising at the foot of the 

 Andes to the north of the Neuquen, runs nearly parallel at a 

 distance of 50 or 60 miles to the north of the Eio Negro. For 

 administrative purposes the district between these two rivers 

 has been annexed to the vast province of Buenos Aires, but t 

 the physical geographer the northern boundary of Patagonia 

 may best be fixed by the course of the Eio Colorado. 



to 



Magella 



9 



geogra 



of that coast, so far as it is known, is altogether the same as that 

 of the Fuegian Archipelago and the adjoining islands. A few 

 of the peculiar species of that region extend into Patagonia, and 

 several others have followed the Pacific coast as far as the south 

 of Chili, even reaching the range called the Cordillera Pelada, 

 near Valdivia ; but in the present state of our knowledge the 

 Magellanic or Fuegian flora may best be regarded as belonging 

 to a separate province whose northern limit may for t' ie 

 present be fixed by a line drawn somewhat south of tbe 52nd 

 parallel of south latitude from the north side of Skyring 

 Water to Cape Virgenes at the eastern entrance to the Straits 

 of Magellan. 



Until lately the only botanical collections received from Pata- 

 gonia came from the points on the Atlantic const at which 

 voyagers have been able to land, of which the best known are 

 Port St. Elena, Port Desire, Port St. Julian, Port Santa Cruz, 

 and Port Gallegos. But the spot on the coast which is best 

 known botanicaily is Bahia Blanca, a place now possessing a 

 civilized population. It lies some fifty miles north of the &o 

 Colorado, and therefore beyond the proper boundary of Fw*" 

 gonia ; but as recent explorations have shown that nearly all the 

 species found about Bahia Blanca extend southward, at least as 



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