In high school in the 1960s (class of 1966), I sampled the water in this drinking fountain to find protozoans to examine in biology class. Unfortunately for me, my sample had a shortage of interesting one-celled creatures to look at, and our microscopes weren't strong enough to see bacteria.
Apparently SDHS students had a different problem in 1918. As you can see from the above photo of boys standing around the fountain, there was a surplus of tiny infective agents at San Diego High School in 1918. According to the San Diego Union Tribune, the masks saved the lives of many people in San Diego during the worldwide flu epidemic.
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