6 THE CONDOR Vol. XIX

All eggs are narrowly elliptical in form, one end being slightly smaller. The two photos of nests clearly show the form. I believe the usual complement of eggs is four, while I think three is not unusual. I have never seen any sets of five, but set no. 3 contained six eggs. As far as I have been able to learn this set of six is the largest of which there is any record. The following tables show the dimensions of eggs, in millimeters. Set No. 1 21.1x13.9 20.6x14.2 21.1x13.9 20.6x14.2 Aver. 20.8x14.1 Fig. 3. AR0W POINTS TO HORIZONTAL CRACK FROM WHICH SET NO. 5 WAS TAKEN ATER RE- IOVAL OF A ROCK EIGHING AT LEAST 35 TONS. THIS NEST WAS ABOUT 115 FT 0M T TOP OF THE CLIFF. Set No. 2 20.6x13.9 20.8x13.9 20.8x13.7 Aver.' 20.7x13.8 Set No. 4* Set No. 5t 21.0x13.0 19.1x12.9 21.2x13.0 19.3x13.1 20.8x13.2 19.9x13.3 20.8x13.2 Aver. 19.4x13.1 Aver. 20.9x13.1 Set No. 3 21.1x13.9 21.3x13. 21.6x13.9 22.1x13.7 21.3x13.9 21.1x13.9 Aver. 21.4x13.8 Set No. 6 20.3x13.2 20.8x13.7 20.8x13.2 Aver. 20.6x13.4

• Measurements by H. S. Swarth, Museum of Vertebrate Zoology.

tMeasurements by Chas. H. Rogers, American Museum of Natural History.