APPARATUS, MATERIAL, AND REAGENTS. 



627 



Tripod Levelling-stand.— A triangular wooden frame sup- 

 ported upon three screw-feet which enable it to be raised or lowered 

 to adjust the level. 



Fig. 257.— Appahatus employed for Plate-cultivations. 

 Tripod Stand ; Glass Dish, filled with cold or iced water ; Sheet of Plate-glass -, 



or a pane of 



Spirit Level, and Glass Bell. 



Large Glass Plate.— A piece of plate-gL 

 ordinary window-glass, about a foot square. 



Spirit Level. 



Glass Bells and Dishes. — Shallow glass bells and dishes, for 

 making a dozen or more damp chambers 

 (Fig. 256), and for completing the apparatus 

 for pouring out liquefied nutrient jelly on 

 glass plates or slides (Fig. 257). 



Iron Box A box of sheet-iron 



(Fig. 258), for containing glass plates during 

 their sterilisation in the hot-air steriliser, 

 and for storing them until required for use. 



Glass Plates. — Small panes of glass, 

 about six inches by four. Not less than 

 three dozen are required for a dozen damp 

 chambers. 



Glass Benches. — These are necessary for arranging the glass 

 plates or slides in tiers in the damp chambers (Fig. 256). Metal 



Fia. 258.— Box for 

 Glass Plates. 



Fig. 259.— Glass Benches fob Glass Plates oe Slides. 



shelves may be substituted for them, but the former are to be 

 preferred. They can be easily made, in any number reqmred, by 



