upon the tenth days of January and July of each year with the American
Reserve Bank an amount of gold coin equal to 7 per centum of its
average deposits during the preceding calendar six months and 7 per
centum of its national bank notes taken out for issue and circulation:
_Provided, however_, That this reserve shall be increased at the rate
of 1 per centum each year for a period of three years thereafter; and
that thereupon and thereafter every national bank shall have upon
deposit upon the tenth days of January and July of each year with the
American Reserve Bank an amount of gold coin equal to 10 per centum
of its average deposits during the preceding calendar six months and
10 per centum of its national bank notes taken out for issue and
circulation.