Transcriber’s Notes

Although both juvenal and juvenile both appear in the text. The term juvenal appears to represent any animal in first year skin, feathers or fur. Therefore, both words were retained as in the original printed version. No significant typographical error were found in the text. For the illustrations, the scale is indicated (i.e., × 9); but is to be taken as a relative scale here as monitor resolutions vary. The list of Publications was compiled at the end.