<628 



APPENDICES. 



■cementing a little piece of plate-glass at either end of a glass 

 sUp (Fig. 259). 



Glass Bods. — One dozen or more glass rods, twelve to eighteen 

 inches in length. They are employed for smoothly spreading out 

 the liquefied nutrient gelatine or agar-agar on the glass plates, etc. 



Thermometers Two or three centigrade thermometers. 



Fid. 260. — IsKAEL's Case'. 



(I) Apparatus for Preparation op Potato-cultivations. 



Israel's Case. — Sterilising instruments in the flame of a Bunsen 



Isurner is most destructive. It is better, therefore, to have a sheet- 

 iron case (Fig. 260) to 

 contain potato-knives, 

 scalpels and other in- 

 struments, and to ster- 

 ilise them by placing 

 the case in the hot-air 

 steriliser for an hour 

 at 150° 0. The box 

 can be opened at the 

 side, and each instru- 

 ment withdrawn with 



;a pair of sterilised forceps when required for ase 



Glass Dishes. — Several shallow glass dishes are required for 



prejjaring damp chambers for potato-cultivations (Fig. 261). The 



Tipper, being the larger, fits 



■over the lower, and having 



no handle, admits of these 



■damp chambers being placed, 



if necessary, in the incubator 



in tiers. The large size may 



also be used in the same 

 way for plate-cultivation.s. 

 Potato Knives. — A 



■common broad smooth-bladed knife set in a wooden handle is sold 



for this purpose. 



Scalpels. — Half a dozen scalpels, preferably with metal handles, 



may be kept especially for inoculating sterilised potatoes. 



Brush. — A common stout nail-brush, or small scrubbing-brush, 



is essential for cleansing potatoes. 



Fig. 261.- 



-Damp Chamber for Potato- 

 cultivation. 



