570 
SUMMARY OF CURRENT RESEARCHES, ETC. 
red pigment in the Florideae. This is effected by filling a flask made 
of green glass with a solution of potassium permanganate, when the 
green colour is completely absorbed, and the glass appears as if colour- 
less. 
Detection of “Masked Iron” in Plants.* — Dr. H. Molisch with- 
draws his previous statement as to the invariable presence of “ masked 
iron ” in plants, on the ground that the reagent employed, potassium 
hydrate, invariably contains traces of iron. Even when the amount of 
iron employed is so small as not to be detected by the most delicate 
chemical tests, vegetable tissues have the remarkable property of with- 
drawing it entirely from solution. 
Ber. Deutsch. Bot. Geselh, xi. (1893) pp. 73-5. Cf. this Journal, 1892, p. G32. 
