vice-president of the united states

from Bouvier's Law Dictionary, Revised 6th Ed (1856)
VICE-PRESIDENT OF THE UNITED STATES. The title of the second officer, in 
point of rank, in the government of the United States. 
     2. To obtain a correct idea of the law relating to this officer, it is 
proper to consider; 1. His election. 2. The duration of his office. 3. His 
duties. 
     3.-1. He is to be elected in the manner pointed out under the article 
President of the United States. (q.v.) See, also, 3 Story on the Const. 1447 
et seq. 
     4.-2. His office in point of duration is coextensive with that of the 
president. 
     5.-3. The fourth clause of the third section of the first article of 
the constitution of the United States, directs, that "the vice-president of 
the United States shall be president of the. senate, but shall have no vote 
unless they be equally divided." And by article 2, s. 1, clause 6, of the 
constitution, it is provided, that "in case of the removal of the president 
from office, or of his death, resignation, or inability to discharge the 
powers and duties of the said office, the same shall devolve on the vice-
president." 
     6. When the vice-president exercises the office of president, he is 
called the President of the United States. 
    

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