10 



43. Holman's " siphon " slide. 



Lent by D. 8. Holman, Philadelphia. 1876. 



This is a thick glass slide with a longitudinal trough, shallow 

 at the sides, deeper in the middle. At either end is a smaller 

 trough, into which opens a small brass tube. The central 

 trough is connected with the lateral ones by seven shallow 

 grooves, and there is a talc cover for them all. 



44. Holman's " life " slide. 



Lent by D. S. Holman, Philadelphia. 1876. 



This is a thick glass slide witTi a deep depression in the 

 middle, a shallow groove crosses this at either end. 



F. LAMPS. 



45. Microscope lamp, with flat wick to burn paraffin 

 oil ; porcelain shade with notch to allow light to 

 shine on mirror of microscope, mounted on brass rirg- 

 stand with upright rod on which it slides. 



Exhibited by F. Darton if Co. 1875. Price 15s. 



46. Microscope lamp with flat wick to burn paraffin 

 oil ; white chimney and porcelain shade with notch on 

 brass circular stand with bronzed rod. 



E. 49.1889. Sought from F. Pastorelli. 



47. Microscope lamp with flat wick to burn paraffin 

 oil ; blue chimney and porcelain shade with notch as 

 above. Mounted on an iron stand with upright brass 

 rod on which it slides. 



E. 50. 1889. Bought from F. Pastorelli. 



48. Microscope lamp for conveying the light by 

 total reflection immediately below the object on the 

 stage. By Koch and Wolf. 



E. 9. 1889. Made by F. Kaltlioff, Bonn. 



The metal chimney is perforated and into the apertures corks 

 are inserted through which pass glass rods directecl towards the 

 flame. The light passes along the interior of the rod and is 

 reflected along its curves and upwards directly into the object 

 glass of the microscope. There are two rods of different curva- 

 tures, one of which can be used for opaque objects. 



