24 First Report on Economic Zoology. 



Fig. 3. — scale, false scale and effect op fbost and canker. 



<i, Mussel scale on apple wood ; .v, the scales ; (il, mussel scale enlarged ; a2, its eggs ; 6, pear 

 twig showing grey scale-like spots (normal plant structure) ; c, apple twig blistered 

 !iy host and canker (?), not insect work ; u and c, blistered area. 



