INTERDEPENDENCE OF ORGANISMS 25 



the while what each insect is doing, in order to be able to 

 interpret the meaning of its peculiarities of structure. The 

 advantage of possessing elbowed and reversible antennae, 

 for example, can only be appreciated after seeing a bee 

 force an entrance into a closed corolla, such as that of 

 Linaria (fig. 169). 



The insects should then be studied in the laboratory , not 

 too hastily, and while still fresh. If allowed to become 

 brittle through drying, they may be relaxed again by plac- 

 ing in a moist atmosphere (as, under a bell jar with a wet 

 sponge) for a few hours. 



They should include the following types : 



1. A long-tongued bee (bumblebee). 



2. A short-tongued bee. 



3. A wasp. 



4. A fly (two winged). 



5. A beetle. 



6. A bug. 



7. A butterfly or moth. 



The record of observations should be made in 

 a table prepared with the following column headings (ab- 

 breviated as desired) : 



Name of the insect. 



Order to which it belongs. 



Flowers on which it was taken. 



Seeking pollen or nectar. 



Proboscis 



| length 



Pollen-gathering parts. 

 Antennae length, form and position. 

 Position of wings when at rest. 



Relative size and weight (as compared with the others 

 of the table). 



