v°|-^gVi.-| SnvFKhVT, Fossil Birds' Eggs. gi 



Fig. 6. — Cross section of the shell of an egg of an existing bird, Crex 

 globicera. The straight edge is the external surface of the 

 shell. Fig. 5 is from near the middle of this piece. Magnified 

 50 diameters. Preparation by Mr. J. W. Gidley. 



Fig. 7. — Cross section of the shell of a fossil egg of a bird (specimen 

 shown in figs. 1-3, Plate I.) (See fig. 11.) Magnified about 

 50 diameters. Negative by Mr. J. W. Gidley. 



Plate III. 



Fig. 8. — Ground-down superficial surface of the shell of an egg of 

 an existing bird, Crex globicera. Magnified about 200 

 diameters. Taken from some part of fig. 9, where the 

 magnification is but 50 diameters. Preparation by Mr. 

 J. W. Gidley. 



Fig. 9. — Same as fig. 8 (Crex globicera). Magnification 50 diameters. 

 Ground-down superficial surface. Prepared by Mr. J. W. 

 Gidley. 



Plate IV. 



Fig. 10. — Cross section of the shell of the fossil egg shown in figs. 1-3 

 of Plate I., being an enlargement to 200 diameters of the 

 section shown in fig. 7 of Plate II., which is enlarged but 

 50 diameters. Preparation by Mr. J. W. Gidley. 



Fig. II. — Superficial ground surface of the shell of the fossil bird's 

 egg shown in figs. 1-3 of Plate I. Magnified 50 diameters. 

 Prepared by Mr. J. W. Gidley. 



Plate V. 



Fig. 12. — Fossil egg of bird ; nat. size. Photographed by the author. 

 St. Gerand de Puy, France. Oligocene. No. 6,496, Coll. 

 U.S. Nat. Mus. Gift of Dr. R. W. Shufeldt. Lateral aspect, 

 and exhibiting in places both shell and concretion. 



Fig. 13. — Fossil bird's egg : imperfect and considerably cracked up. 

 Nat. size. Lateral view. No. 6,497, Coll. U.S. Nat. Mus. 

 St. Gerand de Puy, France. Oligocene. Gift of Dr. R. W. 

 Shufeldt. 



Figs. 14 and 15. — Two somewhat extensive flakes of what appear to 

 be of the nature of a concretion. Possibly they may have 

 been all one piece at some time or other, and may or may 

 not have coated the shell of a fossil bird's egg. No. 6,498, 

 Coll. U.S. Nat. Mus. St. Gerand de Puy, France. Photo- 

 graphed and presented by Dr. R. W. Shufeldt. Nat. size. 



Fig. 16. — Different aspect of the same specimen shown in fig. 4 of 

 Plate I. 



Robins at a Sawmill.— At the sawmill, when the engine whistles 

 blow for the saw to stop, both at mid-day and in the evening, the 

 little Robins come at once to the saw-bench for the insects that 

 have dropped out of the logs. — T. Currie, Lardner. 



