Key legal question
Whether the appeal should still be examined although the 1877 tax was likely payable for formal reasons and the disputed levy was annual.
Extracted holding
Yes. Even if the 1877 tax itself had become moot, the Court considered the general tax-liability question because the levy was recurring annually.
Extracted reasoning
The challenged measure was not a one-off charge but a yearly recurring tax, so deciding the substantive issue remained justified despite possible mootness of the individual year 1877.