Robert Ford's Vagabond Songs and Ballads of Scotland: With Many Old and Familiar Melodies (1904) is available online. Here's the song as it appears in Ford, pp. 325-327:

THE CORNCRAIK AMANG THE WHINNY KNOWES.

O, the lass that I had first o' a'
Was handsome, young, and fair,
Wi' her I spent some merry nichts
Upon the banks o' Ayr.
Wi' her I spent some happy nichts,
Whaur yonder burnie rows,
And the echo mocks the corncraik,
Amang the whinny knowes.

We lo'ed each other dearly,
Disputes we never had!
As constant as the pendulum,
Her heart-beat always gaed.
We sought for joy and found it,
Whaur yonder burnie rows.
And the echo mocks the corncraik,
Amang the whinny knowes.

O, maidens fair, and pleasure's dames,
Drive to the banks o' Doon;
You'll dearly pay your every cent
To barbers for perfume;
But rural joy is free to a',
Whaur scented clover grows,
And the echo mocks the corncraik,
Amang the whinny knowes.

O, the corncraik is noo awa',
The burn is to the brim;
The whinny knowes are clad wi' snaw
That taps the highest whin.
But when cauld winter is awa',
And summer clears the sky,
We'll welcome back the corncraik,
The bird o' rural joy.

Ford's notes: This is the first and only occasion, I think, in which the Corncraik —beautifully feathered, but most unmelodious of birds— has been mixed up in a love song; and the performance, even if it possessed less literary merit —and it has little to boast of— is worth preserving on that account. It is quite evidently a modern effusion, and the author may be living. I have met with it in various cheap songsheets, but nowhere with any name attached. Presumably an Ayrshire ditty, it has yet been sung over the wider area of Scotland. The air, a genuine country one, and attached to other songs, is supplied by Air. Walter Deans, Glasgow.

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Here's my transcription of the melody from Ford. I have to say I'm not happy with the last line, but that's how I read the accidentals.

Click to play