DESCRIPTION OF PLATES. 



The number of diameters which each object is magnified, is expressed in the Plates by small figures 



placed beneath the objects. 



PLATE 1. Test-Objects. 



[airs of the larva of Dermestes lardarius, viewed in balsam. 



2. Hairs of the common bat (Vespertilio pipistrellus), in balsam, a b, coloured 



hairs ; e, a white hair. 



3. Hairs of mouse (Mus domesticus), in balsam. 



4. Pits of coniferous wood, common deal (Abies excelsa), viewed dry. 

 f>. Mucus- (or salivary) corpuscles, seen under different powers. 



6. Scales of Lepisma saccharina, dry. 



7- Scale from the wing of Morpho menelaus, dry. 



; $. Scale from under side of wing of common clothes-moth (Tinea vestianella), dry. 



P. Scales of Hipparchia janira. a, dry, and by oblique light; b, in balsam, by 

 direct light ; c, dry, after Schacht. 



10. Didymohelix ferruginea> under different powers ; 5, with imperfect correction 



or adjustment, c with perfect correction and adjustment ; d> separate fibres. 



11. Didymoprium Grevillii, empty cells. 



1 2. Scales of Podura plumbed, under different powers, dry ; a, 220 diameters. 



13. Pygidium of flea. 



14. Frustule of Grammatophora marina (diagram). , front view ; b, side view. 



15. Frustule of Grammatophora subtilissima (diagram). , front view ; b, side view. 



16. Gyrosigma angulatum ; dry valve showing the dots. 



1 7. Gyrosigma attenuatum ; dry valve showing the lines. 



18. Gyrosigma elongatum\ dry valve showing the lines. 





