- 5 

 tile nucleus and the plastid.*?^, "J'owvn; ths elaioplasts, on the contrary, a more 

 or less intense brown, remained distinct from the nocleus, however, because 

 of , the intensity of the stain and because of its [the elaioplast's] fold and 

 diverse structure Particularly because of its mass subsequent to the con- 

 tlmied action of the reagent, ajid the drops of some unstainable oil. 

 With Sudan III the elaioplasts stain intensely red, 

 I used for this latter reagent an SO per cent alcoholic solution and 

 to get better results first gently heated the sections before subjecting them 

 to the action of the reagent, since the oily substance of the elaioplasts, 

 which is easily soluble in alcohol, becomes somewhat insoluble when, as noted 

 by Eaciborski, it is later heated. Ordinarily a few moments of inmersion in 

 the staining solution suffices because of the intense staining of the 

 elaioplasts. The sections taken from the stain are then carefully washed 

 with water and examined in water or in glycerine. 



Finally I have obtained singulcirly instructive preparations using 

 Scarlet E (2) in the same manner as I did Sudan III. 



Special Part. 



Polianthes tuberosa Linn. 



The elaioplasts are found in this species in the cell cytoplasm in 

 nearly all of the yoimg epidermis and are of special importance because of 

 their notable sise, which they attain in the adult stage, a fact which 

 facilitates greatly their study - 



I observed in living cells [a structure] strongly refractile to light 

 and possessing a color which varied from pale yellow to bro'«.vn. 



