236 MR. W. H. HEYS ON THE KALOSCOPE. 



fibres, with dark beads sprinkled here and there. Viewed 

 by the kaloscope it is instantly transformed into a most 

 lovely stereoscopic vegetable branch, while the glands at 

 the extremities of the twigs glitter like diamonds. 



Sections of wood, spines of echini, and similar objects, 

 may be viewed in two entirely distinct ways. By the plan 

 already described for the mallow they will be found as 

 beautiful as when examined with the polariscope. By the 

 other arrangement, now to be described, the details are 

 brought out in a wonderful manner, and better than by any 

 other mode of illumination. The slide being placed upon 

 the stage, the most oblique light possible must be thrown 

 up through it from the mirror. The kaloscope is then 

 placed between the lamp and the mirror in such a position 

 that the object is fringed by the coloured light, while the 

 ground remains intensely black. This method of illumina- 

 tion may be used with great advantage in examining the 

 hairs upon the edges of leaves and petals, and those also 

 which often spring from the filaments of stamens. 



The following plants supply remarkably beautiful objects 

 of the class in question : 



Tradescantia Virginica (stamens). 



Lamium maculatum (stamens). 



Achimenes (petals). 



Hypericum pulchrum. 



Lysimachia vulgaris. 



Stellaria media. 



Salix (male flowers). 



Salvia splendens (hairs on corolla). 



Asperula odorafca (spines on fruit). 



Narthecium Ossifragum (stamens). 

 It may be added that it is in many cases sufficient to 

 use a glass of the lower set alone. 



The pollen of the Malvaceae, for example, may be shown 

 with a blue ground from the kaloscope, while the surface 



