Fig. 35. 



TERMINATION, GROWTH, TISSUE TENSION. 133 



and glass, and pour in enough water to wet thoroughly the 

 sawdust and the paper. 



(b) Sphagnum moss is better than sawdust; lamp- 

 glasses, supported in the vertical position by being stuck 

 in a pot of soil or sand, are better than 

 glass jars or tumblers. Boot-hairs are 

 well seen in seedlings germinated in 

 moist air ; a simple method is to soak a 

 flower-pot, throw on to its inner surface 

 some seeds whose coats become sticky 

 when wet (Cress, Mustard), then invert 

 the pot (with the seeds sticking to it) in 

 a dish of water. 



Into a wide-mouthed glass jar pour 

 enough water to form a layer about 3 cm. 

 deep. Stick a long pin through a soaked 

 Bean or Pea, and fix it into a cork (or a 

 piece of wood to cover the mouth of the 

 jar), inverting the cork so as to suspend 

 the seed in the moist air of the jar, in which it will ger- 

 minate ; the inside of the jar should be kept moist e.g. 

 with strips of wet blotting-paper. Keep this simple piece 

 of apparatus (Fig. 35) for later experiments. 



170. Glass-sided Box. Besides flower-pots and boxes 

 of the ordinary kind, get a few boxes of different sizes 

 one at least a foot deep for the long roots of Bean seed- 

 lings and make them into glass-sided germination boxes 

 as follows : Remove one of the longer sides and replace 

 it by a sheet of glass sloping downwards and backwards, 

 so that the roots in growing vertically downwards will 

 press against the glass and thus be more readily observed. 

 The glass side may be simply held in position by a series 

 of tacks or nails at either side ; it will be quite easy in 

 this way to make the glass side movable so that it may 

 be inserted vertically or at different angles. 



Fill the boxes with moist sawdust, good garden soil, or 

 sphagnum, and plant the seeds close to the glass. The 

 sawdust or soil should be renewed now and then, since 

 they are apt to become foul; the sphagnum should at 



