CELL-CONTENTS STARCH. 



239 



consist of two layers, an upper and a lower one ; and the 

 collapsed vesicular bodies of an extremely fine but strong 

 and elastic membrane." Mr. Busk believes the hilum 

 to be a central opening into the interior of the ovate 

 vesicle. 



J9 



. 



SW 



^iv* ^ 

 %^As 



Fig. 145. 



Yeast-plant. 2, Stinging-nettle Hairs, Urtica Dioica. 3, Ciliated 

 onferva. 4, Starch grains, broken by the application of heat. 5, 

 -- 



spores of Conferva. 4, Starch grains, broken by the application of heat. 5, 

 Starch from Tous-les-mois. 6, Starch from Rice. 7, Starch from Sago. 8, 

 Imitation Sago-starch. 9, Wheat-starch. 10, Rhubarb- starch, in isolated 

 cells. 11, Maize-starch. 12, Oat-starch. 13, Barley-starch. 14, Potato- 



early all starch-grains aosent. i, section 01 fotato, cens 

 starch. (These starches are grouped for comparison.) 

 spawn, elongated cells. 



19, Mushroom 



Nitric acid communicates to wheat-starch a fine orange- 

 yellow colour ; and recently-prepared tincture of guaiacum 

 gives a blue colour to the starch of good wheat-flour. 



