BAIRD &L TATLOCK. (LONDON) LTD. 



SECTION No. 19. 



Apparatus for Seed Testing and Soil Analysis. 



BAIRD ft T AT LOCK LONDON 



5662 



5663 



5664 



5662 s Stoneware Pots, 10 by 10 in. inside, with tubulure as used for plant cultivation at Royal 

 Agricultural Society's Experimental Station, Woburn Sands each, 6/- ; per doz. 



5663 s Diaphanoscope, Dr. Vogel's. Price, without lamp 



DESCRIPTION. 



The apparatus consists of a cube-shaped metal case provided with a door. Inside, a mirror is so arranged 

 that, on being slightly moved, rays from a given source of light are thrown in a perpendicular and upward direction 

 on to a perforated copper plate, p, holding about 100 grains of the seeds. 



The test is conducted as follows : -Throw a handful of seeds on to the copper plate, and shake gently until 

 the holes are filled, then allow the excess to roll off. By placing the " dull " plate underneath the copper plate 

 a better means of differentiation is obtained. On the passing of the light, it will be found that the floury grains 

 completely prevent the penetration of the rays, whereas the vitreous grains, according to their density, are more 

 or less illumined. Among the latter, those of a dark yellow colour generally predominate, and with a little practice 

 a speedy conclusion may be arrived at regarding the quality of the seeds. Seeds which allow light to pass through 

 their entire length are highly vitreous, and therefore difficult to dissolve. 



5664 s Diaphanoscope, Lenarcie's, for the investigation of grass seeds, barley, and wheat, for 

 their farinaceousness and hardness. Price, with instructions for use 



360 

 1 10 





2 10 



1023 



