"22. (a) Tars, pitches, and tar oils, not otherwise provided for; mineral oils, crude or refined (except gasoline, naphtha, and other similar products or distillation), including those illumination, lubrication fuel, or solvents, vaseline (except when compounded with other substances); axle grease of all kinds; asphaltums; carbolineum and similar compounds; gross weight, one hundred kilos, twenty five cents.

"(b) Gasoline, naphtha, and other similar products of distillation, gross weight, one hundred kilos, fifty cents.

"Provided, That no article classified under clause (a) of this paragraph shall pay a less rate of duty then ten per centum, ad valorem.

"Provided, finally, That though imported under a name referable to clause (a) of this paragraph, paraffin, or other similar products, shall be classified under paragraph eighty-three of this Act."