250 PRACTICAL LESSONS IN SCIENCE. 



care is necessary to prevent them from decay or from becoming 

 mouldy. 



Parts too thick or heavy for drying may be preserved in alco- 

 hol, or may be described in the label and not preserved. Lichens 

 may be dried and kept in boxes without pressing. Mosses, liver- 

 worts and algae, when it is desirable to preserve color, should be 

 immersed in glycerine or Miiller's solution. 



When dry, the specimen may be transferred to a sheet of heavy 

 paper and fastened by strips of gummed paper, and the label 

 should be written on the paper or fastened to it in some way, so 

 that it may not be lost or separated from the specimen. The 

 size of the sheets commonly used for specimens is thirteen or 

 fourteen inches long by ten to eleven inches wide. 



