APPENDIX. 425 
[NoTE. There are many herons’ eggs of the above color, but they are all > 1:25 
long. There are also many white eggs, tinged with blue (or green), and perhaps 
among them should be included those of the Goshawk and Cooper’s Hawk. Many 
ducks’ eggs are strongly tinged with blue, green, drab, or yellowish. Most of them 
are laid on the ground or in hollow trees, but all are more than an inch and three- 
fourths long. The only ducks commonly breeding in Massachusetts are the Dusky 
Ducks, who build on the ground, and the Wood Ducks, who build in Hollow trees.] 
Color, brown, drab, or buff. } 
. On the ground, except the last, and sometimes ‘‘3.” 
Ay. 1°65<1'25, pale drab buff to rich reddish buff.4 Partridge. §30, III. 
. Ay. 1'65<1°35, brownish drab or paler. Nest where dry. Prairie Hen. §30, II. 
Ay. 1°901'50, drab. Birds usually colonialinswamps. Bittern. 
<°75X°‘55; usually marked. Nest among reeds. Z-b Marsh Wren. §7, II, B. 
- In the holes of trees, or rarely in a nest made in a fork. 
About 2:001:50. Yellowish-white, or very pale drab. Summer Duck. 
4Often somewhat marked. 
For § Il of. this Key, see the next page. 
