Found him on the 1880 Brooklyn, Kings, New York census (dist 161 img 4) as
Arthur A. Dowst age 7.
The business successfully carried on in Greenpoint for many years by the late Mr. John A. Dowst, as producer and dealer in cider and vinegar, is continued at the old place, on Meserole avenue, being now in the hands of his son, Mr. Arthur A. Dowst, who, having been for a considerably time associated with his father in it, brings to the management thereof all the needed experience.
The worthy son of a worthy sire, Mr. Arthur Dowst will no doubt succeed in keeping the business at the high standard of prosperity to which his father raised it, and even increasing the extensive patronage which it has deservedly long enjoyed. - The Newtown Register January 18, 1894
Found him on the 1900 Brooklyn Ward 17, Kings, New York census (dist 264 img 26) as
Arthur A. Dowst, married, age 27. Cider & Vinegar [in business with his father]
Found him on the 1916 list of registered voters for San Francisco County.
Found him on the 1920 San Francisco Assembly District 32, San Francisco, California census (dist 201 img 7) as
Arthur A. Dowst age 47, manager, Keystone water co. He is married to
Estelle age 44, born California.
Found him on the 1930 San Francisco, San Francisco, California census (dist 213 img 10) as
Arthur A. Dowst age 57. Manager, water co. He is married to
Estelle age 38. Cashier, water co. Also in his household is his widowed mother
Ella R. Wolcott age 80.