In the episode where they built a bon fire to destroy Chinese lice and "help morale," what was the name of the song Col. Potter sang that started "Keep the home fires burning...?"

Reproduced below are the lyrics to the hugely popular wartime song written in 1914, Keep The Home Fires Burning, music by Ivor Novello and words by Lena Ford. The song is also popularly known as Till The Boys Came Home.

Keep the Home Fires Burning

They were summoned from the hillside
They were called in from the glen,
And the country found them ready
At the stirring call for men.
Let no tears add to their hardships
As the soldiers pass along,
And although your heart is breaking
Make it sing this cheery song:

Keep the Home Fires Burning,
While your hearts are yearning,
Though your lads are far away
They dream of home.
There's a silver lining
Through the dark clouds shining,
Turn the dark cloud inside out
'Til the boys come home.

Overseas there came a pleading,
"Help a nation in distress."
And we gave our glorious laddies
Honour bade us do no less,
For no gallant son of freedom
To a tyrant's yoke should bend,
And a noble heart must answer
To the sacred call of "Friend."

Keep the Home Fires Burning,
While your hearts are yearning,
Though your lads are far away
They dream of home.
There's a silver lining
Through the dark clouds shining,
Turn the dark cloud inside out
'Til the boys come home.

firstworldwar.com
This site has two audio links to hear the song.
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This should be it. It makes sense that Col. Potter would sing a WWI song. It seems to me that he was in a tontine with some other soldiers, the "prize" being a bottle of brandy. If I remember correctly, it started in WWI. (In fact, it may be the same episode that you remember.) Remember that Col. Potter was at least in his late 50s in the series, which was set in the Korean War, only 30-some years after WWI.

Yep. See here for the episode, "War of Nerves."

The episode guide entry below doesn't mention lice, but does mention a bonfire.

124. War of Nerves (edit)
First aired: 10/11/1977
Writer: Alan Alda
Director: Alan Alda
Guest star: Allan Arbus (Sidney Freedman), Johnny Haymer (Zale) , Michael O'Keefe (Tom), Peter Riegert (Igor)

The 4077th, caught up in tension and nerves, creates a bonfire to release their pressure. Meanwhile, Sidney Freedman is depressed over a young soldier who blames him for his injuries, because Freedman had sent him back into combat. - M*A*S*H Episode Guide, tv.com

A Methodist, Sherman Potter was from Hannibal, Missouri, the childhood home of Mark Twain. (Two early episodes mention a home in Nebraska, however, and Potter implies in another episode that he's a Presbyterian.) He learned (among other things) Army foot care from a fellow Missourian–future President Harry S Truman. Potter also reveals early on that he's one-quarter Cherokee.

Sherman Potter enlisted in the Army at fifteen, when he lied about his age to get into the cavalry, presumably during World War I. (His exact age during the series is debatable. In the episode "Pressure Points", Potter gives his age as 62. With the episode set in 1952, he would have been fifteen in 1905, well before the war.) Col. Potter gave distinguished service, earning the Good Conduct Medal. Because he was an enlisted man at the time, he was eligible for one. Potter noted that neither MacArthur or Bradley had earned such an award. (This is a continuity error: The Army did not issue a Good Conduct Medal until 1941, by which time Potter had become a medical doctor and a commissioned officer.)

During World War I, he and a number of his friends spent the night in a French chateau while under fire. They came across a cache of brandy, and proceeded to drink all but one bottle. They made an agreement (a tontine) that the last survivor of the group would take the bottle and make a toast to his friends. Potter turned out to be the last survivor of the group, and drank a toast to his old friends, together with his new ones in the unit.

After World War I, Sherman Potter entered medical school, and four years later became a doctor. (We never learn what sparked his interest in becoming a surgeon, "the only kind of doctor I ever wanted to be." He knew a number of doctors at home, and had joined the Army because he'd craved adventure as a boy. Perhaps the Army had made it possible for him to go to medical school, or having had enough adventure, he now pursued other goals.) During this time, he married Mildred. Potter went through residency in Saint Louis. After residency, Potter served in the Army in a number of positions up until the time of his service in Korea. Prior to his service at the 4077th, he served as a hospital administrator. He and Mildred purchased a home in Missouri, and raised a son and daughter. He and Mildred became grandparents when a granddaughter was born in the early 1950s. - Encyclopedia.The FreeDictionary.com

By the way, welcome to AnswerPool!

A trivia footnote on Ivor Novello:Thought of as a patriot because of his wartime songs,he was jailed in 1944 for the unpatriotic act of misuse of petrol coupons ( coupons issued during petrol rationing in Britain). As he arrogantly drove a Rolls Royce in wartime it's hardly surprising that he was a bit short of fuel. He was also the man who didn't write 'Me Tarzan, you Jane'. He did write the script for Tarzan the Apeman but the line is 'I Tarzan, you Jane'

If I remember correctly, in the Weissmuller film, the line that Tarzan said (poking at his, then at Jane's chest alternatively) was, "Tarzan. Jane. Tarzan. Jane." I don't think he ever said, in that first movie, the line, "Me Tarzan, You Jane", and I am certain he didn't say "I Tarzan, you Jane." Weissmuller must have realized that Tarzan would not have known to use the proper pronoun.

[QUOTE]Originally posted by DorianGreyed:
If I remember correctly, in the Weissmuller film, the line that Tarzan said (poking at his, then at Jane's chest alternatively) was, "Tarzan. Jane. Tarzan. Jane." I don't think he ever said, in that first movie, the line, "Me Tarzan, You Jane", and I am certain he didn't say "I Tarzan, you Jane." [QUOTE]

Me wrong. You right.

Here's the full story with quotes:

Who? Me?