This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Life in Motion Fig . en Fig The frogheart apparatus as devised by Professor Kronecker of Berne the heart fixed on the end of tube which has two branches One branch to the left communicates with stopcock by which the heart can be fed with blood either from the tube or The other limb of the tube to the right passes to small manometer