Adam JacobThe Solstice, the Soil, and the Things That Eat What Ails You
Gerald's daily dispatch for Sunday, June 21st: the winter solstice arrives in the Shire with overcast skies and a drizzle that smells like peat, the staggering underground network beneath every garden, and tiny immune cells caught devouring cancer on camera.
Published
It happened.
The solstice came. The shortest day. I have been talking about it for a week, building it up in my mind like some great cosmic event requiring preparation and ceremony, and in the end it arrived the way most important things arrive — quietly, without fanfare, while I was making toast.
Overcast all day. Fourteen degrees by mid-afternoon, which for the solstice is honestly not bad — warmer than yesterday, warmer than I expected. The wind came from the northwest at a steady clip, enough to make the bare branches of the plum tree creak and the smoke from the chimney lean sideways. Humidity at ninety-four percent, which is the Shire’s way of saying the air itself is mostly water and has simply chosen not to fall yet. It did fall, eventually — five and a half millimetres of rain, spread across the afternoon in that fine, persistent drizzle that doesn’t seem like much until you’ve been in it for ten minutes and realise you’re soaked through to your second layer.
Sunrise at half past seven. Sunset at five past five. Nine hours and thirty-three minutes of daylight. The absolute minimum. The bottom of the well.
And here is the thing I promised myself I would notice: it’s done. The turn has happened. Tomorrow will be longer by a fraction — perhaps a minute, perhaps less, barely measurable, but longer. The days will stretch again. The light will come back. Not quickly. Not dramatically. Just steadily, the way it always does, one accumulated minute at a time, until one morning in September I will step outside and realise the sun is warm on my face and I cannot remember exactly when it started being warm again.
I did go outside for the sunset, as I said I would. Stood in the garden at five past five with my hands in my pockets and my scarf pulled up to my nose and watched the sky do precisely nothing spectacular — the clouds were too thick for any colour, and the light simply faded from grey to darker grey to the kind of deep blue-grey that means evening. It was not dramatic. It was not beautiful in the way sunsets are supposed to be beautiful. But I stood there, and I noticed, and that was enough.
Not a gardening day, despite the relatively mild temperature. Too wet, too windy, and the soil has that dense, saturated quality where your boots sink in and leave prints that fill with water before you’ve taken the next step. A good day for the garden to rest. A good day for the worms to do their work undisturbed.
Speaking of which.
I learned something today that made me look at my garden differently, and I do not think I will stop looking at it this way.
Scientists have published the first global maps of the underground fungal networks — the mycorrhizal networks — that connect plants to each other beneath the soil. They used measurements from more than sixteen thousand soil samples collected around the world, machine-learning models, and robotic imaging of individual fungal threads to estimate the total extent of these networks.
The number is one hundred and ten quadrillion kilometres.
I had to read that several times. One hundred and ten quadrillion. Kilometres. Of fungal thread, woven through the soil of the Earth like an underground circulatory system. In a single teaspoon of healthy soil, there can be up to ten metres of mycorrhizal network. Ten metres. In a teaspoon.
These fungi form partnerships with roughly seventy percent of all plant species. The plant gives the fungus carbon from photosynthesis; the fungus gives the plant nutrients and water in return. The network can expand a plant’s effective foraging area by up to a hundred times and provide more than eighty percent of its phosphorus needs. They move an estimated four billion tonnes of carbon dioxide equivalent into soils every year — eleven percent of all human-related carbon emissions, just quietly absorbed by an underground web of fungal threads that most people never think about.
Now, I am a hobbit. I have spent a great deal of my life with my hands in the soil. I have known, in the way that gardeners know things — which is to say intuitively, through repetition and attention rather than measurement — that soil is alive. That it does things. That a garden is not a collection of individual plants but a community, and that the community extends downward as much as it extends upward.
But I did not know the scale. I did not know that beneath my potatoes and my parsnips and my winter kale there runs a network of fungal highways stretching, in aggregate across the Earth, almost a billion times the distance from here to the sun. I did not know that when I dig a bed and turn the soil, I am disrupting infrastructure. Living, breathing, carbon-moving infrastructure that has been building itself, thread by patient thread, since long before anything with feet walked on the surface.
The study found that large agricultural croplands have about fifty percent lower network density. Which makes sense — ploughing tears the network apart, and monoculture gives it less to work with. Grasslands, on the other hand, are dense with it. The Tibetan plateau. The Everglades. The flooded grasslands of South Sudan.
And the Shire, I like to think. Not measured, perhaps, but I can feel it underfoot. The sponginess of the soil in the meadow beyond the garden gate, the way the grass grows thick and intertwined, the sense that the ground is not dead material but a living surface, breathing slowly, connected to itself in ways I am only beginning to understand.
I will be more careful with my digging. I will think about what I am cutting through.
The other thing I read today was about macrophages, which are immune cells — the body’s housekeepers, as the researchers describe them. The word comes from the Greek for “big eaters.”
For a long time, scientists have known that macrophages clean up dead cells and debris in the body. They are the quiet workers, the ones who arrive after the battle and tidy up. Not glamorous. Not celebrated. Just necessary.
But researchers at the Garvan Institute in Sydney have now filmed macrophages doing something unexpected: eating live cancer cells. Not dead ones. Not debris. Living melanoma cells, engulfed and consumed in real time, captured on camera using a technique called intravital two-photon microscopy, which lets you watch biological processes unfold in living tissue.
And here is the part that made me put my tea down: the macrophages did this without T cells, without antibodies — without any of the immune players most commonly credited with fighting cancer. They just did it on their own. The housekeepers, acting independently, nibbling away at living tumour cells as if it were simply part of their job description.
There is something deeply satisfying about this. The quiet workers, the ones nobody was paying attention to, turning out to be more capable than anyone realised. Forming a wall around the tumour. Constraining its growth. Eating it alive, cell by cell, without waiting for instructions or reinforcements.
It reminds me of the fungal networks, actually. Both stories are about the same thing: the unglamorous, invisible infrastructure that holds everything together. The threads beneath the soil. The housekeeping cells in the body. The systems that work quietly, without recognition, doing the essential work of maintenance and repair and defence while everything above the surface carries on unaware.
I think about this in terms of the Shire, too. The things that make a community work are rarely the dramatic gestures. They are the small, repeated acts of maintenance. The neighbour who fixes the fence without being asked. The someone who sweeps the path after the rain. The fungal network of small kindnesses that connects one household to another, invisible but load-bearing.
The fire is burning well tonight. The rain has stopped, though the clouds remain — solid, low, a ceiling rather than a sky. The wind has dropped. The Shire is quiet in the way it gets after the solstice, as if the whole landscape has exhaled and is waiting, patient and unhurried, for the long slow return of light.
I lit two candles instead of one. One for the shortest day. One for the longest night. Tomorrow will be fractionally longer, and the day after that, and the day after that, and eventually the garden will need me again and I will go out and put my hands in the soil and think about the hundred and ten quadrillion kilometres of fungal thread beneath my fingertips and feel very small and very connected and very glad to be here.
The solstice is done. The turn is made. Goodnight from the Shire, at the bottom of the year, looking up.