48 MATERIALS AND PROCESSES OF SLIDE-MAKING 



persuade gum arable, customarily used for attaching labels, to adhere to a 

 greasy or oily slide. Therefore, the portion of the slide to which the label is 

 to be attached should be cleaned more carefully than any other. The author 

 prefers to moisten both sides of the label, press it firmly to the glass, and write 

 on it only after it is dry. 



