A collection of four envelopes from the later 1800s written French cursive script and stamped. 
 
One is a standard envelope and three are folded paper. Traditionally, when sending correspondence, sheets of paper were folded over and sealed with sealing wax. 
 
One has no contents,  it may have contained a ticket or lightweight item. The other two  are bills dated 1880 and 1881,  one is from Bourgeois Paris and the other is rather creased, but still interesting, with a lovely old French postage stamp.