A J. 
Data Campbell's No. of 
No. 
No. in 
Book. 
Eggs. 
we 
THE JACKSONIAN OOLOGICAL COLLECTION. 
and others, so this shows that the clutch which I took was by no means an exception to the rule, and 
that white eggs are frequently laid instead of the chocolate coloured type, which is considered the 
normal type. (See Rock Warbler, data No. 547.) An egg of this clutch measures in inches = 0°76 
oO 
On 
7. 
ORANGE-WINGED TREE RUNNER, 
Sittella chrysoptera, Latham. 
Large set of 4 eggs, taken by W. McEnerny, Frank and Sid W. Jackson, six miles from South 
Grafton, Clarence River, N.S.W., on the 16th of September, 1894. The nest is a handsome structure, 
and was placed in the upright fork of an Iron-bark Eucalypt (Zucalyplus siderophloia), at an altitude ot 
60 feet. These birds possess true and wonderful instinct in making their nests accurately harmonize 
with the surroundings, and they 
are very difficult to detect. I 
have noticed that they build upon 
the dead upright forked limbs 
much more frequently than on 
those which are green. The 
decoration of these nests, which 
is often very beautiful, may be 
claimed as evidence of the exist- 
ence of «esthetic sensibility 
amongst birds ; but although my 
years of observation lead me to 
credit birds with a certain amount 
of reasoning power, I, like other 
naturalists and lovers of nature, 
am inclined to think that utility 
and protective mimicry are in the 
main responsible for all the won- 
derful skill and art displayed in 
their architecture, and it is this 
which makes ornithology such a 
delightful study. The two accom- 
panying photographs (pages 64 
and 66) show how neatly these 
little birds can cover or thatch 
the nest with small shingles of 
bark, which are perpendicularly 
fastened on with cobwebs and a 
glutinous secretion, making it 
closely resemble the branch upon NEST OF THE WHITE-HEADED TREE RUNNER. 
which it has been built. During (Nearly natural size.) 
Loc., Glen Ugie Peak, Clarence River, N.S.W. 
(See data No. 382, page 67.) 
some seasons these birds are 
rather common inthe bush about 
Sydney. An egg of this clutch measures in inches = 0°67 x 0°53. 
BLACK-CAPPED TREE RUNNER, 
Sittella pileata, Gould. 
Set of 3 eggs, taken by J. A. Hill at Kewell, near Murtoa, Victoria, on the 27th of September, 
1894. The markings on these specimens are larger than on those of the previous set. An egg of this 
clutch measures in inches = 0°68 x 0'53. 
66 
