I found the image above at FamilySearch.org in the California, San Francisco Area Funeral Home Records, 1835-1931 collection. This project was indexed in partnership with the California Genealogical Society and Library. Name index and images of funeral home records from the Halsted N. Gray - Carew & English Mortuary Collection, located at the San Francisco Public Library. Images for all years in collection can be browsed, but name index currently covers only years 1896-1931. Collection includes a number of different funeral homes acquired over time by the Halsted N. Gray - Carew & English Mortuary company, most from the San Francisco area, but also including some from Burlingame, Stockton, and Sacramento. The collection includes funeral register books, burial registers, account books, case books, etc. Indexes appear at the beginning of some volumes.
This record is a funeral register book. It would be a great substitute for a Death Certificate if you couldnít find one. Typically individuals were buried a few days after their death. The record above is from 1878. It gives you their name, age at death, and place where they were buried.
If you have ancestors from San Francisco, give this a try. I would do a search on just their last name as well if I had ancestors from San Francisco. You might come across a child who died at an early age that you donít have a record of.