16 !&tet of Sllustrations 



PAGE 



APPLE MUSSEL SCALE 207 



LEPISM^E SACCHARINA 210 



PURPLE HELLEBORE 212 



SPINNING MITE 213 



BEETLE MITE 213 



CHEESE MITE 213 



OWL'S SKULL .216 



DUCK'S SKULL 216 



WOODCOCK'S SKULL . 217 



PHEASANT'S SKULL 217 



