LIQUID MEDIA. 



101 



the passage of light. The water makes its exit and 

 entrance at the side tubes a, a, and the temperature 

 is indicated by a thermometer in front. 



FIG. 36. SECTION OF ISRAEL'S WARMING APPARATUS AVD 

 DROP-CULTURE SLIDE. 



Israel's Warming Apparatus. It is obvious 

 that in employing very high powers a difficulty will 



F IG . 37. ISRAEL'S WARMING APPARATUS. 



be presented by the warm stages just described 

 owing to their interference with the illumination. 



