PLATE 26. 



Low-power Photomicrography of Opaque objects 

 displayed on a black background. 



A HIND-LEG OF HONEY BEE, inner surface x 16 

 B LEAPING SPIDER x 12 



Objective Crouch 2" Achromat. Stopped down. 



Ocular None. 



Condenser ... Bull's-eye projecting convergent beam. 

 Illuminanl ... Incandescent gas. 



Plate Imperial Special Rapid. 



Exposuj'es ... 12 and 10 minutes. 



A small stop placed between the component lenses of the objective 

 to get sufficient depth of focus. 



i 

 Hind-leg of Bee mounted as a dry preparation on dead black paper 



in the centre of a glass slip. No cover glass used. 



The largest segment of the tarsus of the 3rd leg is provided on its 

 inner surface with ten rows of stiff hairs, the pollen combs, which are 

 used to comb out the pollen from the hairs on the body arid legs. 

 Two pollen grains can be seen adhering to one of the combs. 



The Spidej- was completely immersed in methylated spirit in a 

 watch glass lined with black paper. 



Photos. W. B. R. To follow page 192. 



