82 



THE MICROSCOPE. 



June 



and a frequenter of our cornfields, has peculiar scales 

 shaped like a battledore with a long handle, and the 

 longitudinal lines are swollen at intervals into rounded 

 elevations, which give a dotted appearance, except to- 

 wards the base, where a crescent-shaped cloud of minute 

 pigment-cells crosses the scale, and forms a distinguishing- 

 mark of the species. 



Scales can be mounted dry or in balsam and can be 

 used as opaque or transparent objects. The silkworm. 



moth (Bombyx movi) has a variety of scales, some toothed, 

 some broad and some narrow, and it is said there are 

 400,000 of these scales on the wings of one moth. The 

 scales from the under side of the little clothes-moth are 

 very finely striated and make good test objects. Also 

 those from the Podura (figs. B, D, and E), found in the 

 spring about sawdust, under stones, and in damp places. 

 It has SIX legs but no wings, and its body is covered with 

 beautiful scales. 



The Lepisma saccharina is the litLle silvery gray in- 



