Ishi (? - 1916) was claimed to be the last California Yahi Indian. He was discovered in 1911 in the foothills near Mt. Lassen. His story was popularized in a book by Theodora Kroeber[?], wife of A.L. Kroeber, who worked with Ishi.
... would be "I pervade all this universe...".
"mat-sthaani" in the second line is a compound
of "mat" (me) and "stha" (standing, staying at) and
means "they are in ...