»0 BROOK OR SPECKLED TROUT. 



ked than in the preceding cut: The cells have 

 also decreased in size, their substance having 

 been taken in part into the circulation. 



Fig., 6 shows the appearance of the young 

 trout when it leaves the egg, highly magnified. 

 Nothing could be more beautiful than every part 

 of the fish when placed under the microscope , 

 its transparency affording to the observer a per- 

 fect view of the circulation in every part; the 

 corpuscles of blood being not only shown in the 

 arteries and veins, but also in both cavities of 

 the heart. 



In the tail and some other parts of the fish 

 the circulation may be seen making the entire 

 circuit. The cells by this time have become 

 much reduced in size, and appear in clusters ow- 

 ing to their absorption in the more immediate 

 vicinity of the vessels. At the time of its birth 

 the only fins developed are the pectorals — a 

 natural size of the egg — b natural size of the 

 the trout when it leaves the egg. 



MICROSCOPIC VIEWS HOW OBTAINED. 



In order to get a good microscopic view of the 

 living young fish, or eggs, during the process of 

 incubation, they should be placed in a glass cell, 

 made sufficiently tight to hold water. By this 

 means the young fish may be kept alive for quite 



