MR. W. H. HEYS ON THE KALOSCOPE. 237 



is illuminated in the ordinary way with the bull's eye. It 

 then forms a highly attractive and pleasing object. 



It is thought that the efficacy of this instrument in 

 connexion with such a variety of purposes cannot fail to 

 render it of much value to the scientific observer. It most 

 certainly enables him to detect details of structure which 

 are inconspicuous without its aid. By the exquisite beauty 

 with which it paints many kinds of objects it will also 

 allure the beginner to continue his researches at a time 

 when probably he might abandon the pursuit as tedious. 



To all who have refrained from using the microscope 

 through fear of hurting their eyes, it can further be recom- 

 mended as calculated to remove all anxiety ; for when the 

 blue glass of the lower set is used, even if no other end be 

 gained, the light is delightfully toned down, and in a way 

 that can only be appreciated by those who have worked 

 at the microscope for many hours at once. 



