My transcription from the album "I Belong to Glasgow: Greatest Hits of Will Fyffe" (2011), as found at Spotify:


DR MACGREGOR
As sung by Will Fyffe

I needn't introduce mysel; ye all ken wha I am,
Unless you are a stranger in the place.
I'm known through all the countryside for fifty miles aroun
By ma tricycle, ma figure an ma face.
The children in the neighbourhood, they're awfy feart for me,
For when I appear there isn't one about,
But I often see them peeping roond the corner o the door,
Then to their mothers they begin to shout:

CHORUS: It's Doctor MacGregor and his wee black bag,
Doctor MacGregor and his wee black bag,
Known ev'ry cottage door through all the countryside.
There's not a bed in all the place I havenae sat beside,
And the ladies all adore me though I dinnae want to brag,
But they're glad to see MacGregor and his wee black bag.

The young folk laughin think that I'm a relic o the past.
Like my tricycle, I'm gettin out o date,
But the older generation in the village swear by me,
Though the population isn't very great.
There's a younger doctor takin up a practice in the place—
He's up to date and got a motorcar—
But the tricycle ma faither had before me daes for me,
Though it doesnae go so quick or half as far.

[Patter ending with this recitation:]

If ever money came ma way, I spent it,
And if a friend should want a loan, I lent it;
And if I to the races went, I'd bet it,
Then when the income tax came in, regret it.
I dinnae want want you to think I'm wealthy.
I'm glad to be alive, strong and healthy;
And if I haven't got a penny when life ends,
Thank God I've got a fortune in my friends!

[Repeat chorus]