SEC. 20. And be it further enacted, That it shall be the duty of the Comptroller of the Currency to countersign and enter in the book, in the manner aforesaid, every transfer or assignment of any bonds held by the Treasurer presented for his signature; and the Comptroller shall have at all times during office hours access to the books of the treasurer, for the purpose of ascertaining the correctness of the transfer or assignment presented to him to countersign ; and the Treasurer shall have the like access to the book above mentioned, kept by the Comptroller, during office hours, to ascertain the correctness of the entries in the same; and the Comptroller shall also at all times have access to the bonds on deposit with the Treasurer, to ascertain their amount and condition.