Notes:
Notes:
"For a good many years it has been a puzzle to some thoughtful and practical people to locate the deposits from which the Mission Fathers, who pioneered California, made their hydraulic or "Portland" cement, as it is called in the language of the trade. At El Toro, a station on the line of the Santa Fe's branch to San Diego, 10 miles south of Santa Ana, 40 miles from Los Angeles, and 5 miles back from the coast, the deposits are located. There is a mountain of limerock, technically known as silicate of aluminum."