294 INTRODUCTION TO ZOOLOGY chap, xix 



Refer to Forest Entomology,"hy Gillander, for further details, also 

 to the Gambridge Natural History, vol. vi. p. 586. 



4. Examine apple and other fruit trees for the Mussel Scale 

 Insect, and with a strong magnifying lens, try to make out its 

 structure and life-history. 



Refer for further details to the First Report on Economic Zoology, 

 by F. V. Theobald. 



