skull with this, we would strongly recommend the student thoroughly to master this portion of the work, and in no way can he do this more thoroughly and quickly than by taking a parboiled frog, picking off the skin, muscle, and connective tissue from its skull, and making out the various bones with the help of our diagrams.
Text Book of Biology, Part 1: Vertebrata · The Wunder Library — complete classics, free to read, with narration.