Both the law of averages and traditional Harvard theatrical indifference take a beating this week over on Holyoke Street, where the third undergraduate hit in as many weeks sent last night's audience upstairs to the famous Pudding after-the-show cabaret humming good tunes and roaring at the mere thought of Theodore Allegretti. Recent patrons of Sanders Theatre probably remember Allegretti as an intense young man with a flare for speechifying. But it is as a comedian, occasionally whimsical and droll but usually nothing short of hilarious, that he stands out in a show which is full of entertainment value, from book and music on down through sets and costumes.

Author Craig Gilbert got hold of a good historical triangle in the Miles Standish-Priscilla Mullins-John Alden business, molded assorted Pilgrims and Indians into some stock but sound musical comedy characters, and came through with a creation that manages not to sag between the songs, which is no small feat. Nor do the songs delay the action of the book. Both come together into a balanced musical that is played with the sort of informal enthusiasm that can make a good amteur show more entertaining than all but the best of professional shows.

For purists and people who compare everything with "Oklahoma!"--the show has faults, including a weak finale, a dreary Indian ritual dance, and an occasional monotony in the total effect of the score. For connoisseurs of show music the best songs are "New England in the Autumn," a gay number by John Knowles, John Lemmon, and William Scudder, and "If He Ain't Got a Woman," a bluesy tune by Courtney Crandall and Sendder. For mothers and sisters of Pudding members Julian Hatton, Jr., as a beautiful Priscilla and Frederick Lamont, Jr., as somebody funny called Billington stand out in the all-male cast. And for those who want to follow a few drinks by an entertaining first act, a few drinks, an entertaining second act, and a few drinks see "Speak for Yourself." You will.