NOTE. 
Pied du Roi. This standard is used in the works of Bonaparte, Finsch, 
Hartlaub, Schlegel, and Temminck, and also in those of most of 
the older French authors. 
English Duodecimal. Used by Audubon, Macgillivray, Pallas, and 
all earlier American, English, and Russian authors. 
English Decimal. Used by Baird, and most recent American, English, 
and Russian authors who have not adopted the metric system. 
Metric System. Most modern authors, except those mentioned above. 
Naumann uses " Leipziger oder gewohnliches Werkmass." The Leipzig 
foot = 0.9275 English foot, 0.2827 metre, or 0.8703 French foot. 
The foot used by S. Nilsson and other Swedish ornithologists is 0.9742 
English foot, 0.9141 French foot, or 0.2969 metre. 
The Rhineland foot (which is the same as the Prussian, Rotterdam, and 
Danish foot) is frequently used by the earlier German authors. It cor- 
responds to 1.0298 English feet, 0.9663 French foot, and 0.3139 metre. 
