Page:Paper and Its Uses.djvu/137

Rh are usually meant. The highly-glazed surface is more suited for writing, while the rougher side takes the gum for the flap better than a burnished surface. Envelope papers are usually cut at an angle to prevent waste when cutting out blanks for envelopes. Demonstration of the waste involved by the use of square paper can be made by opening an ordinary envelope, and marking it out on an ordinary sheet of paper.