ARTHROPOD A 275 



2. Thoracic appendages: 



Legs: number, position, kinds, joints, special adaptations 



to special work. 

 Wings: number, size, position, structure, principal veins. 



Compare the first and second pairs as to size, structure 



and function. 



3. Abdominal appendages: number, structure, function. 



III. Make a table comparing these and other available forms 

 as to their eyes, simple and compound. 



IV. Find, if possible, another form embodying the same 

 general features found in each of the above-mentioned animals. 



V. Compare these (or other forms which may be selected) 

 from the point of view of their habits. Introduce all discovered 

 correlation between structure and function. 



1. Haunts and place of living. If peculiarly local, can you 

 find any reasons ? 



2. Locomotion: methods, and the efficiency of. 



3 . Feeding : material used, and the method of obtaining it. 



4. Respiration: organs and their location; any special points 

 as to their use. 



5. Special senses: physiological evidences; morphological 

 evidences. 



6. The laying of eggs and provision for the young. 



(The library may be used profitably to supplement field 

 work in this section.) 



VI. Study by observation the homes, temporary or perma- 

 nent, their mode of construction and uses, in the following: 

 Spiders (as many species as possible), the paper- wasp, the 

 mud-wasp, the honey-bee, the bumble-bee, ants, flies, etc. 



VII. Development or life history. Studies may be made in 

 natural conditions in many cases by periodic observations. 

 When this is not possible, animals may often be reared in con- 

 finement by supplying the appropriate conditions. This is a 

 very attractive line of investigation and one in which real 

 contributions to knowledge may be made. The following are 

 some of the matters to be kept in mind. 



i . Is there a metamorphosis or is development direct ? (See 

 text, 330.) 



