Deep Thoughts by Robert Hooke

On looking at ice forming on urine under a microscope:

"Tafting several cleer pieces of this Ice, I could not find any Urinous tafte in them, but thofe few I tafted, feem'd as infipid as water."

"If you take any cleer and fmooth Glafs, and wetting all the infide of it with Urine, you expofe it to a very fharp freezing, you will find it cover'd with a very regular and curious figure."

Wonder how he got his results?