There were so many checks in yesterday's mail that it will take me two days to list them. If the mail continues to run heavy, as it often does just before Dec. 31, I will have to fall behind in my reports about it. As they say in Pennsylvania Dutch country, the faster I run, the behinder I get.

But I'll be as uncomplaining as a stockbroker looking at a ticker tape that's running 30 minutes behind the floor action because trading volume is heavy. All my problems should be as pleasant as this one.

We begin today's tally with $4 from the Kensington Bridge. A woman who collected for Children's Hospital at meetings of the Catholic Daughters of Virginia and the Home Demonstration Club of Rock Springs raised $18.70. Brownie Troop 1299 (2d and 3d Graders from Lakewood School, Rockville) worked to earn $5 for Children's Hospital. An adult pleased with their showing matched their gift to make it $10. Another adult, doubly pleased, made it $20.Bridge players might record the transaction as "$5, doubled and redoubled." Another $20 arrived from tenants of the Potomac Plaza Office Building in Fort Washington.

Children who sang carols on Pershing Drive in Silver Spring ended up with $21, cold feet and happy memories. The Military Traffic Management Command Ladies Club sent me $25. So did the Nursery School Teaching Staff at St. Raphael's Church.

A check for $26.85 bore the cryptic notation, "Office Goofs." There may be a good story behind that check, but where are Woodward and Bernstein now that we really need them?

The Printing and Production Control unit at the National Georgraphic had $36.01 left at the end of its Christmas party, but guess who has the money now. Bowlers in the Wednesday Morning Stars Bowling League at Penn Daw passed up their usual gift exchange to divert $41 to medical help for needy children. Personnel at Chemco Photoproducts Co. raised $45.

The Lewisdale Citizens Association dipped into its treasury for $50. The office party in the National Oceanic and Atmospheric Administration's Office of Management and Computer Systems operated on a tight budget that left a $63 surplus for Children's Hospital. Employees of Manor House, in Vienna, chipped in $65.Members of the English Studies Division of Prince George's Community College in Largo got up a pool of $85.

For seven years, the hospital received faithful support from Sperry Remington employees, but no more. Their corporate name was changed, so we now credit $93 to Remco Business Systems.

Honeywell's Field Engineering and Commercial Divisions teamed up to round out a $100 contribution. Another $100 arrived from the customers and management of the Tremont Restaurant in Falls Church.

The Office of the General Counsel at the D.C. Board of Education decided to hold a bake sale to raise money for Children's Hospital but things didn't work out. "We ate up all the cookies before the sale ever started, so we're just sending in some money," said a note pinned to a $100 check.

No in-house holiday cards were exchanged by employees of the Tax Treaty and Technical Services Division of the Internal Revenue Service and $105 was thereby detoured to do more sensible work for needy children. The no-cards plan produced $110 when it was used in another IRS unit, Branch 3 of the Legislation and Regulations Division of the Chief Counsel's Office. Checks totaling $110 were also received from employees of Alan M. Voorhees & Associates of McLean.

Employees of the Marlo Furniture Store in Forestville rounded up $143 for the hospital. A wine-and-cheese party held by the Women's Auxiliary to the Metropolitan Washington Association of Plumbing, Heating and Cooling Contractors netted a nifty $316.50.

Tip-of-the-hat for today's biggest contribution is in the direction of the Veterans Administration. No intramural holiday cards were exchanged in either the Office of the General Counsel or the Office of Construction, and the returns therefrom were beautiful to behold: $285 from the lawyers and $473.50 from the builders, for a juicy total of $758.50.

In all, 25 groups turned in $2,481.56, and 49 individuals added $1,038.53 to make today's $3,520.09. We had $69,924.15 in the shoebox when we started this morning, so it now holds $73,444.24. With one reporting day remaining in 1977, we have just squeezed past our $72,125 end-of-the-year mark for 1966.

That's like holding a 3-point lead with 58 minutes left to play.