418 GENERAL BIOLOGY 



peculiar character of the soil or water, they were preserved, can furnish 

 us with any accurate record of the past. 



There are men who have taken up individual studies in order to 

 ascertain all the details of their given specialties, and such men are named 

 after the study-group they have adopted as such specialty; for. example, 

 one who specializes on the protozoa is called a Protozoologist ; one who 

 studies worms is known as a Helminthologist ; one who studies mollusks, 

 a Conchologist ; one who studies insects, an Entomologist, while he who 

 studies birds is an Ornithologist, and he who studies mammals, a Mam- 

 mologist. 



It is, of course, understood that these men may not be interested in 

 classification alone, but that they may be Anatomists, Physiologists, 

 Ecologists, etc., also in regard to their favorite study. 



The checking up of the different conclusions which different workers 

 in the same field, and different workers in different fields have arrived at, 

 is one of the most interesting and valuable studies possible. This is 

 particularly true, because so frequently all the evidence that a Paleon- 

 tologist accepts, points to a totally different conclusion from that which 

 the student of experimental genetics finds to be true. The history of 

 science is replete with cases of groups of men having held and defended 

 doctrines most valiantly, and with seeming correctness, entirely opposite 

 to those of men in other fields of study. 



References. 



Schull, "Principles of Animal Biology." 



H. C. Oberholser, "The Nomenclature of Families and Subfamilies 

 in Zoology." Science, Aug. 13, 1920. 



TABULAR VIEW OF THE CLASSIFICATION OF ANIMALS AS 



FAR AS ORDERS 



(After Hegner, Schull, Handlirsch, Brues, Melander, Muttkowskr, 



and Wheeler.) 



PHYLUM I. PROTOZOA 



Class I. Rhizopoda ( ) 



Order 1. Lobosa ( ) 



Order 2. Heliozoa ( ) 



Order 3. Radiolaria ( ) 



Order 4. Foraminifera ( ) 



Class II. Mastigophora ( ) 



Order 1. Flagellata ( ) 



Order 2. Choanaflagellata ( ) 



