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trout. The lateral line is similar in both of these species. A 

 bluish tint extends all along the back from the head to the tail, 

 so that when seen from above, the fish appears entirely blue ; 

 hence the name of Blue Back, given to it by the settlers of that 

 neighborhood. The sides and abdom.en are silvery white in 

 the female, and of a deep reddish orange in the male, spotted in 

 both sexes wilh orange of the same hue as the abdomen. The 

 dorsal and caudal fins are brownish blue, bordered with pale 

 orange in the male, the pectorals, ventrals, and anal, of a fiery 

 orange, blackish blue at their base, with their margin of the 

 purest white. When just taken out of the water it is impossible 

 to imagine any thing more beautiful and more delicate in the 

 way of coloration in fishes of the temperate zone. 



" The abode of the ' Blue Back ' is, as stated above, the Moose- 

 megantic Lake, in which it is concealed during the greatest part 

 of the year ; but about the 10th of October, it comes near 

 shore and ascends in shoals the Kenebago for the purpose of 

 spawning. Half a mile above its mouth, the Kenebago receives 

 the outlet of Lake Oquassa ; the trout there leaves the Kenebago 

 to the left and runs towards Oquassa Lake, where its voyage 

 comes to a close. After the middle of November it goes back 

 into Moosemegantic Lake and is seen no more until October of 

 the next year. The ' Blue Back ' having hitherto received no 

 systematic name, that of Salmo oquassa is proposed for it." 



The flesh of this fish is highly flavored, and more delicate than 

 that of the brook trouts in Europe and America. It resembles 

 that of (S. unibla, of the Swiss lakes, both in the peculiarity of its 

 habits and its delicacy. Salmo umhla is a lake trout, an inha- 

 bitant of the deep, making its appearance near shores in Janu- 

 ary and February to spawn, and never ascending the brooks or 

 rivers, tributaries of these lakes. 



Dr. W. L Burnett read a paper on the '' Origin, develop- 

 ment, and intimate structure of the Renal organs through- 

 out the Vertebrata." 



The renal organs appear under two forms, — the embryonic 

 or so-called Wolffian bodies, and the permanent or true kidneys. 

 The temporary Wolffian bodies are found in all Vertebrata, 

 excepting the fishes and amphibia, and they persist as active 



