ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



781 



Vacuum Paraffin Oven.* — L. Materna describes a paraffin stove 

 (fig. 126) for imbedding, the principal feature being a thermostat, the 

 copper jacket of which is filled with distilled water. The outside of the 

 thermostat is covered with linoleum, and the apparatus is fitted with 



Fig. 127. 



the usual thermometer and thermo-regulator, and is heated by means of 

 a Bunsen burner. Inside the thermostat is a strong glass jar (fig. 127) 

 connected by tubes with a water-pump. Between the water-pump and the 

 th ermostat are inserted a manometer for indicating the pressure, and a wash- 



* Zeioschr. wiss. Mikrosk., xxv. (1908; pp. 439-45 (2 figs.). 



