DR. BUREAU ON THE PARTRIDGE. 213 



is still within its sheath and the first and second have 

 not appeared at all. 



At the 24:th day (23-25) the tenth primary falls and 

 a new feather at once begins to grow, so that immediately 

 afterwards the bird wears a mixture of three plumages. 

 (1) the head and neck are downy ; (2) the body-feathers 

 and the wing-feathers except the tenth, and the tail (35mm. 

 long), belong to the juvenile plumage; (3) the new tenth 

 .primary of the first winter-plumage. The first and second 

 have not yet sprouted. Beak, brown ; feet and nails, 

 pale yellow. It can fly 100-150 metres, and weighs 

 about ninety grams. 



On the 21th day the ninth primary is dropped and the 

 tenth has grown 15mm. The first and second have 

 begun to grow, the tail m^easures 40mm., and some 

 feathers have appeared on the crown. 



On the 3^rd day the eighth primary is lost, the ninth 

 having reached a length of 29mm., and the first and 

 second 23 and 31mm. respectively. Tail 45mm. long, 

 and the body completely clothed in the juvenile plumage. 



On the 39th day the seventh primary falls, and the 

 eighth has grown 34mm, while the first and second 

 have reached respective lengths of 32 or 33 and 46 to 

 55mm. 



On the 4:7th day the sixth primary is dropped, when 

 the seventh is 39mm. long. In the most forward birds the 

 grey feathers with red crossbars of the first winter-plumage 

 are beginning to show on the flanks and the speckled 

 feathers are also appearing on the sides of the breast, 

 and as far as half way up the neck, forming two bands, 

 which approach one another in the middle line. A few- 

 first winter -plumage feathers are also beginning to show 

 in the middle of the back. Length from tip of beak 

 to end of median tail-feathers (growing rectrices of the 

 first winter plumage) 225mm. Expanse from tip to tip of 

 third primaries (the longest) 447mm. Weight 228 grams. 



On the 55th day the fifth primary is lost, and the sixth 

 has grown 44mm. ; the first and second have lost their 

 basal sheaths, and measure 83 and 94mm. respectively. 

 The second and third most external of the median coverts 

 are generally sufficiently developed for their sexual 



