650 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



8 E A M A N. — Exhibition of Lamp and Vertical Illnminator. 



[Ho Kiiil, " Yon may renu lubcr that some time ago I showed a vortical 

 illuruiuator made by Mr. Clias. Fasoldtof Albany. I have here a slide of his 

 rulings, which contains li) bandn, from 5000 to 120,000 to the inch, which is 

 no doubt a very excellent specimen of this kind of work, similar to the cele- 

 brated Nobert plates. I have no hesitation in saying that on an object of thia 

 kind, with an immersion-lens, the definition obtained by this illuminator is 

 superior to anything I have ever seen, and that by its means the liuman vision 

 may bo pushed to its utmost limit."] 



Amer. Hon. Micr. Journ., IX. (1888) p. 97. 



(4) Photomicrography. 



Leitz's small Photomicrographic Apparatus. — This, fig. lOG, is an 

 adaptation of several somewhat similar forms which have been already 



Fio. lOfi. 



