I am looking at a 1870 census record for Daniel Dorris in New York City.
In column 19 there is a mark. Column 19 is Male Citizens of US of 21 years of age and upwards. There are several different marks in this column, a slash, what looks like a y and what looks like an X. There is a total number of marks in the column listed at the bottom. 8 marks total. Also in the tabulation on the bottom is the number 8 for no. of males, foreign born.
The instructions for the 1870 census states: "The inquiries in columns numbered 11, 12, 15, 16, 17, 19, and 20 are of such a nature that these columns only require to be filled when the answer to the inquiry is "Yes." If the person being enumerated had a father or mother of foreign birth; if he or she attended school during the year; if he or she cannot read or cannot write; if he is a citizen of the United States above the age of 21, and if, being such citizen, his right to vote is denied or abridged on other grounds than participation in rebellion or crime, then an affirmative mark, thus, (/), will be drawn in each of the above columns opposite the name."
If I understand the column label and the instructions then Daniel was probably naturalized and had the right to vote. What troubles me is the differences in the marks in the column.