386 FOREST ENTOMOLOGY. 



in many diseases, and the incalculable value of trained laboratory 

 research work. 



Such are a few " hints " to the student from the writer's point of 

 view ; but it is possible that even advanced enthusiastic students may 

 show a greater desire for life-histories than minute investigation. 

 Hence fig. 351 may be taken as a typical case of the life-history of an 

 insect, inasmuch as we see the successive stages of larval develop- 

 ment. In the example given we have, of course, an excellent instance 

 of the correct method for cabinet purposes ; but in reality all insects 

 should be worked out on similar lines, and the various stages noted 

 and tabulated in a book kept for the purpose. 



