19



Cages for passage. Shelves for seed-room


Spouting


Baths (7)


Fixing baths, making dumb wells

Lead waste pipe

Painting aviary

Levelling, bricks, etc..


Cementing floor



246

5 18 9

250

10 2 9

1 8 6

12 2 o



200



1 S 6



Total



£95 9 6



I should explain that the second dumb well was made to

carry off the water from the spouting on the north side, and also

partly for the advantage of another aviary a little distance away.

Added to these expenses were many small items, such as seed-

pots, fir branches, wooden nest boxes for the Parrakeets, etc., so

that^roois not too much to put down as the total cost. Of

course it seems a great deal to spend, but aviaries are expensive

buildings to put up, that is of course if you are determined to make

your little prisoners as happy as possible : and surely that is the

duty and pleasure of every bird-keeper.


I have given many details, thinking they might be of use

to anyone thinking of putting up an aviary, as giving them some

idea of the cost. Should any of our members be in the

neighbourhood I should be very pleased to show them the

aviary, or would send them photographs of the back and interior

(which would explain it far better than I have done) and also

more detailed particulars with a ground plan.


I do not by any means set up the aviary as a perfect one,

but the birds (who should be the best judges) seem thoroughly

happy in it. I should add that it is not heated in any way.



TWIN STUDIES.



By A. G. Butler, Ph.D.



In an article which I published in Vol. IV. of our Magazine

(pp. 101-3), entitled “Scientific Aviculture,” I attempted to

show how the breeder of foreign birds might render the facts

which come under his notice of value to the cabinet-naturalist:

but the observations of the breeder by no means exhaust the

treasures to which the student of living birds alone holds the

key.


As I have pointed out in other articles, the aviculturist, in

order to be successful in breeding, must learn to distinguish the

sexes of his birds whilst yet alive. I11 many cases this can be



