22 STRUCTURAL AND SYSTEMATIC ZOOLOGY 



information which will enable him more clearly to com- 

 prehend the description of related forms mentioned in 

 the text. 



In every case careful drawings should be made of 

 the specimen, and full notes on its habits and structure 

 prepared. 



The appliances needed are a scalpel and a pair of 

 forceps, both of medium size ; a magnifying glass ; a 

 compound microscope, if protozoa and other minute 

 forms are to be studied ; and a small board on which 

 larger specimens may be laid for, the study of the struc- 

 ture. If alcoholic specimens are to be studied they 

 may be placed for examination in vegetable dishes con- 

 taining equal parts of alcohol and water to prevent 

 drying of the parts. There should be enough of the 

 mixture to cover the specimen. Specimens which 

 have been preserved in formalin may be examined in 

 water. For more particular descriptions of specimens 

 and methods of work reference may be made to the 

 laboratory manuals and text-books mentioned in the 

 Appendix. 



INVERTEBRATES 

 Protozoa 



Amoeba 



Material. More or less uncertainty usually attends 

 every attempt to provide at a given time a supply of 

 amoebas for a laboratory class. Nevertheless, the study 

 of this organism should not on any account be omitted, 

 for from no other one is so much to be learned regarding 

 the fundamental properties of living things. A thor- 

 ough study of the amoeba forms the basis of all sound 

 biological training. 



Specimens of amoeba are often to be found in the 



