This section is from the book "The American Bird-Keeper's Manual", by James Mann. Also available from Amazon: The American Bird-Keeper's Manual.
The old birds generally moult about the beginning of autumn. They require also nourishing food at this period. Give them freely of rape-seed, a bit of bread dipped in milk, and occasionally a bit of hard-boiled egg, and lettuce or cabbage. Sometimes it happens, that from some cause, this operation of nature is retarded or stopped, and the bird does not shed his old feathers, or does it very slowly, in this case I have found it efficacious to put a few cloves in the water, and give them plenty of green stuff. If the weather is cold when they moult, do not expose them to it; but if mild and warm, I have found it beneficial to an old bird, when moulting, to be kept outside of a window or door; at least, let them have plenty of free air, and keep a rusty nail in water. In moulting, the proper treatment of the old birds is about the same as the young, only they do not require so much care and attention, as the most hazardous time with Canaries is their first moulting.
 
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