The Commissioner of Agriculture and his agents shall have free access, at all reasonable hours, upon and into any premises or structures to make examination of any agricultural, vegetable or flower seeds, whether such seeds are upon the premises of the owner or consignee of such seeds or on the premises or in the possession of any warehouse, elevator, railroad or steamship company. The Commissioner may, in person, or by his analysis inspectors or assistants, upon notice to the dealer or his agent or the representative of any warehouse, elevator, railroad or steamship company, if present, take for analysis a composite sample of any agricultural or vegetable seeds from a parcel, package, lot or other container or a number of parcels, packages, lots or other containers.