what is clear jelly-like substance I find on top of soil in garden, in troughs and pots at this time of year?

Image by clattermonger
The garden final takes some sort of shape – the compost heap goes to the back wall where it’s going to stay, the concrete slap is broken up and shifted out, the flower beds down the south fence starts to fill with soil, and the earth montain is nicely coming down in size. Both fences are treated and the base of the south fence is whitewashed.

Question by garden gnome: what is clear jelly-like substance I find on top of soil in garden, in troughs and pots at this time of year?
I find this in small clumps in the garden soil or across the top of soil-filled troughs. They are small, quite solid pieces as if someone has roughly cut up a clear dessert jelly. I wonder if it is from frogs, snails etc.

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