California Pioneers' Moore and Mason Jars

In the first display at The Society of California Pioneers, alongside my previously posted bottles and sewing machine, are some jars. I don't know much about jars, but they appear to be "Moore" jars. Moore jars tend to be from the late 1860s or early 1870s, though as the fourth picture indicates, this one is from 1861 (at least the patent). The jar in the third picture, however, is a Mason's jar, and it dates from 1858.

I wonder what these jars were used for? I would assume fruit, no?

From my recent trip to the Society of California Pioneers...