THE BOTANICAL OUTFIT 41 



sizes of window glass and will do very well for 

 most specimens. 



17. Liquid Glue. Glue is the only mountant 

 strong and lasting enough to be of much use in 

 holding specimens permanently in place. 



18. Gummed Paper or Surgeon's Silk Isin- 

 glass Plaster. When a large number of plants 

 or several similar ones have been identified, it 

 is wise to attach name-tickets to their stems 

 lest the names should be forgotten or confused 

 before mounting. They can be easily affixed 

 with strips of gummed paper and as easily re- 

 moved. Some sort of adhesive strips should 

 form part of every outfit, for they are useful in 

 mounting. (See Chapter VIII.) 



Gummed paper can be bought in sheets 

 17 x 22 inches for from 10 to 15 cents per sheet 

 and also comes in strips and rolls. A better 

 material for use in mounting plants, however, 

 is silk isinglass plaster which can be bought of 

 any druggist, in rolls 5 or 7 inches wide and a 

 yard long, for from 60 to 75 cents. It is so 

 much stronger and more adhesive than ordi- 

 nary gummed paper that it can be used in 



