232 CHEMISTRY OF FARM PRACTICE 



extent. Glues are variously termed hide glue, bone glue 

 and fish glue, due to the source from which they are derived. 

 Bone glue and hide glue have essentially the same general 

 characteristics, while fish glue has less jellying properties. 

 Liquid glue is made by treating fish glue with acetic, hydro- 

 chloric, or nitric acid, any one of which will cause the loss of 

 the property of gelatinizing when cold. 



