102 BACTERIOLOGY. 



To overcome this an apparatus has been con- 

 structed by which the slide is warmed from above.* 

 The drop- culture slides are provided with a 

 shallow groove *i mm. deep and i mm. broad, cut 

 round the concavity. Into this the cover-glass fits, 



FIG. 38. ISRAEL'S WARMING APPARATUS IN OPERATION. 



so that its upper surface is flush with that of the 

 slide. The heating apparatus consists of a flat disk- 

 shaped box with a central conical aperture (Fig. 36). 

 The entrance and exit pipes are fixed on at a 



* Israel, Zeitsch.f. Wiss. Mikrosc, ii., pp. 45963. 1885. 



