The average size of 158 eggs is 28.97 x 20.37 millimeters. 



Of the above sets, numbers 6, 9, 27 and 57 were laid by the 

 same bird, numbers 6 and 27 were from one nest and numbers 9 

 and 57 from another nest. 



This shows how these birds retain the same nest from year to 

 year. The dates were No. 6, May 28, 1899; N°- 9' J^"^^ ^^' 

 1899; No. 27, May 19, 1900; No. 57 June 5, 1900. Though 

 the dimensions of these four sets vary, the color and markings of 

 all are the same. This fact has often been mentioned in regard 

 to Hawk eggs taken from the same nest on consecutive years. 



Following are averages taken from fifty-eight sets, taken during 

 two years. Average number of eggs, 2.72. Average height of 

 nest from ground. 3.9 feet. Of these n^sts, forty were in cholla 

 cactus, sixteen in nopalo cactus, and two in palma trees. 



My earliest and latest records for fresh eggs were May 17 and 

 July 2. The first brood is hatched about June i and leaves the 

 nest in twelve days. The second nest is usually built by this time 

 and the eggs are deposited shortly after. 



On May 28, 1899, I found a nest with four young about two 

 days old. This same pair of birds on June 11 had a new nest 

 with three eggs. The male bird assists in incubation and also in 

 care of the young. 



Following are the measurements in millimeters of ten sets of 

 Palmer's Thrasher. 



Set No 



The average size of 79 eggs is 28.68 x 20.05 millimeters. 



