144 FISH HATCHING. 



circulation under a high power I was assured 

 of there being matter other than blood cor- 

 puscles circulating in the veins, and, on further 

 examination, came to the conclusion that 

 there were globules of fat mixed with the 

 blood. On examining into the course of the 



o 



circulation I find that the blood is conveyed 

 from the heart (which is visible just under 

 the gills of the fish) into the liver by a branch 

 of the large trunk artery, which, after giving 

 out branches to the intermediate spaces be- 

 tween the ribs, to the kidneys, &c., is finally 

 lost in the ring of muscular fibre in the tail ; 

 that from the liver, part proceeds by the 

 large vein, shown in drawing No. 2, straight 

 to the heart ; the remainder, after ramifying 

 over the umbilical vesicle of the fish, is finally 

 collected in the large vein (inferior vena 



