Smell is the strangest of the senses. It bypasses everything -- language, reason, time -- and goes straight to the part of the brain where childhood is kept.

You can spend a lifetime forgetting your grandmother's house. The dimensions of the rooms, the wallpaper pattern, the order of the doors down the hall. You forget all of it. Then one day, in a stranger's kitchen or a department store or your own basement, you catch one specific smell, and you are eight years old again, and she is alive, and the screen door is about to slap shut behind you.

Here are 12 of those smells. You'll know them.

1. Pot roast and onions, cooking since morning

By the time you came in from outside on a Sunday, the whole house smelled like this. Not just the kitchen. The whole house. The beef in the bottom of the cast-iron Dutch oven, the onions slowly collapsing in the fat, the carrots and potatoes added at hour three.

You can buy beef. You can buy onions. You cannot recreate the way that smell moved through a small house with the windows closed in February. It required her. It required the day.

2. Cedar from the linen chest

Every grandmother had one. Usually at the foot of the bed, sometimes against the wall in the hallway. The hinges were brass. The inside was raw cedar -- never finished, never sealed -- and it smelled like the inside of a clean forest.

She kept the good blankets in there. The quilts her mother had made. Sweaters off-season. Maybe a wedding dress, wrapped in tissue, that she had been saving for sixty-three years for no specific reason.

Open the chest now and the smell is the same as it was in 1968. Cedar doesn't change. We do.

3. Mothballs in the back of the closet

The smell was sharp, chemical, faintly medicinal. You opened the closet to get something and a wave of naphthalene hit you in the face.

The mothballs were keeping the wool coats and the good suit safe from moths. They were arguably working. They were certainly not pleasant. But the smell of mothballs is the smell of that closet, in that hallway, in that house, and you will recognize it instantly forty years later in a thrift store, and you will not be able to say why your eyes are stinging.

4. Mentholatum on the bedside table

The little glass jar with the green metal lid. She used it for everything -- a cold, a stuffy nose, sore muscles, a child's chest at bedtime. The smell was eucalyptus and camphor, sharp and clean and a little bit alarming.

She'd rub it on your chest when you had a cough. The smell would fill the bedroom. You'd lie there breathing it in, half-suffocated, half-comforted, until you fell asleep. You can still buy it. It still smells the same. It just doesn't work without her hand.

5. Aqua Net hairspray in the bathroom

The pink-and-silver can lived on the counter. She used it generously, sometimes with the bathroom door closed, and the chemical cloud that came out under the door could strip varnish.

It smelled sweet and metallic and slightly suffocating, and it was the last thing she did before going anywhere -- church, a wedding, the grocery store on a Saturday morning. The smell of Aqua Net is the smell of a grandmother who is about to leave the house, looking the way she has always looked.

6. White Shoulders, or Estée Lauder Youth-Dew

Her perfume. She wore the same one for fifty years. She put it on in the morning and again before company came over, with the little glass bottle she kept on top of the dresser.

When she hugged you, you smelled it for the rest of the day. Now you smell it on a stranger at the grocery store and you have to stop and put your hand on the cart to steady yourself.

The bottle is still on her dresser, probably. Or it's at your mother's house, in a drawer, waiting for someone to do something with it.

7. Pillsbury crescent rolls baking

The Saturday afternoon smell. Sometimes biscuits. Sometimes bread, if she'd had the day for it. Mostly Pillsbury rolls out of the popping cardboard tube, in a pan in the oven, while she got the rest of dinner together.

That buttery, yeasty, slightly burnt-on-the-bottom smell drifting out of the oven on a winter afternoon is one of the most specific sensations in American memory. You can produce it in your own kitchen. It will not smell the same. The smell required her oven, and her kitchen, and her watching it through the little oven window.

8. Coffee from a percolator

The percolator was on the stove from six in the morning until somebody finally turned the burner off. The coffee was always too strong by ten and undrinkable by two. She drank it anyway.

The smell was deeper than what a modern coffee maker produces -- more roasted, more bitter, more full of itself. It filled the kitchen. She drank it black, in a cup with a saucer, sitting at the table reading the paper while you ate cereal across from her.

9. The basement -- cold, mineral, faintly musty

Every grandmother had a basement, and every basement smelled the same. Damp concrete. The faint mineral tang of an old water heater. A whiff of laundry soap from the washer in the corner. Maybe a hint of mold, but the good kind, like a wine cellar.

It was the smell of cold air rising up the stairs when you opened the basement door. It was the smell of going down to get a jar of preserves from the shelves, or a sled out of the corner, or a Christmas decoration from the box.

It is the smell of any older house you walk into today, and your body remembers it before your mind catches up.

10. Lilac from the bush outside the kitchen window

The bush had been there for fifty years before she planted it, probably. It bloomed for two weeks in May, and the smell came in through the kitchen window with the breeze, and the whole house was lilac for those two weeks.

She cut some and put them in a jelly jar on the kitchen table. They wilted in three days. She cut more.

The smell of lilac is the smell of being eight years old at her kitchen table in the second week of May, and you will get exactly two weeks a year to remember it, and then you have to wait again.

11. Lemon Pledge on the wood furniture

Friday was cleaning day. The whole house got dusted, vacuumed, mopped, polished. The wood furniture -- the dining table, the side tables, the buffet, the piano -- got a heavy spray of lemon Pledge, rubbed in with a soft cloth.

The smell was sharp lemon and waxy and just slightly synthetic, and it lingered in the rooms for the rest of the day. When you walked in on a Friday afternoon, you knew immediately what day it was.

12. Cigarettes mixed with clean linens (if she smoked)

A specific kind of grandmother. She smoked, but she also kept the house spotless and the laundry pristine. The two smells coexisted in a way that doesn't really happen anymore.

The cigarettes were in the ashtray by the chair where she did the crossword. The linens were folded in the closet, the sheets line-dried, the towels washed in something floral. The combination -- tobacco and lavender, ash and cotton -- was hers and only hers.

If you grew up with that smell, no other grandmother's house has ever smelled right since.

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Most of these are still available. You can buy White Shoulders. You can buy Pillsbury rolls. You can plant a lilac bush.

But the smells alone won't bring her back. What she had was a specific arrangement of all of them at once, in rooms that no longer exist, on afternoons that already happened. The smells are how you find your way back to the memory. The memory is the thing you actually want.

Light a candle. Open a closet. Walk into an old house. She is closer than you think.

You don't go looking for the smell. The smell finds you, and for a second, she is right there.