Abstract
A corrosion cast of the entire blood vascular system was made by a single injection of resin from the heart of carp and a Japanese catfish. Either semipolymerized methyl methacrylate or Mercox CL with 30-50~ methyl methacrylate monomer was used as the resin preparation. The latter was better for photographing. Both were polymerized by addition of 1 ~o benzoyl peroxide. The segmental blood vessels of carp and a catfish showed an alternating arrangement of artery and vein in successive segments with some irregularity.
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