“ Although the juvenile condition of the parr is now universally admitted, it is a remarkable fact that many male parr, from 7 to 8 inches long, have their sexual organs fully developed, and that their milt has all the fertilizing properties of the seminal fluid of a full-grown and sexually matured salmon. On the other hand, no female parr has ever been obtained with mature ova. Not only the salmon, but also the other species of Salmo, the grayling, and probably also the Coregoni, pass through a parr-stage of growth. ”