58 Miss M. Wheldale. Colours and Pigments of [Oct. 31, 



present, though in smaller quantity than in the orange species. The pink 

 tinge is due to anthocyanin. 



Glaucium luteum has plastids containing carotin and xanthin. 



G. phceniceum, an orange-red species, has anthocyanin in addition. 



Papavcr nudicaule exists in three varieties, orange, yellow and ivory- 

 white. The pigment appears to be of the xantheic type, which becomes 

 paler on addition of acids and alkalis, and is not precipitated by lead 

 acetate. 



Polemoniacea. 



Phlox Drummondii has already been considered. The xantheic pigment 

 is deepened by acids and alkalis and precipitated by basic lead acetate as 

 a deep yellow precipitate. The ivory gives the yellow colour-reaction, and 

 the albino, which does not give this reaction, is recessive to yellow. 



Panunculacece. 



Ranunculus spp. have plastids containing carotin and xanthin. 



Rosacea?. 



Potentilla fruticosa has plastids containing xanthin. 



Cream Rosa spp. contain a plastid pigment similar to that in cream 

 Matthiola. 



Scroph ulariacea;. 

 Antirrhinum has already been fully described. 



Calceolaria spp. contain a xantheic pigment intensified in colour by acids 

 and alkalis, and precipitated by basic lead acetate as an orange-brown 

 precipitate. In some cases plastids containing xanthin are also present. 



Varieties of yellow Ncmesia strumosa have a xantheic pigment, which 

 becomes paler on treatment by acids and alkalis. 



Veroascum Lychnitcs has a xantheic pigment giving a blue colour with 

 sulphuric acid, fading to yellow, a yellow colour with alkalis, and a yellow 

 precipitate with basic lead acetate. 



Solanaxeai. 



Hyoscyamus Chloranthus, a yellow species devoid of purple veining, has 

 plastids containing xanthin. 



Physalis Alkckengi has plastids containing carotin and xanthin in the 

 orange calyx. 



Salpiglossis grandijlora shows the anthocyanin-plastid series. The deep 

 yellow is due to plastids containing carotin and xanthin ; the pale yellow 



