Section 2. That the compensation of the officers and employes mentioned in the first section of this act shall be as follows: The assistant clerks shall receive the sum of eight dollars per diem for each regular, biennial, special or extraordinary session, and five dollars per diem compensation for the first ten days of a succeeding session; the janitors and elevator operator shall each receive six dollars per diem for each regular, biennial, special or extraordinary session; the assistant clerks shall each receive four dollars per diem, the janitors and elevator operator shall each receive three dollars per diem for the time necessarily employed during the interim between legislative sessions; all officers and employes mentioned in the first section of this act shall receive mileage to and from their homes, to be computed by the ordinary mail route between their homes and the State Capitol, at the rate of ten cents per mile.