ITS Seme account of Amici’s Discoveries 
Upon placing this slice on a hot iron, in order to examine its 
phosphorescence, I was surprised to observe that the^Ao^p^o- 
rescent matter was arranged in strata or veins parallel to those 
of the specimen, and each stratum emitted a phosphoric light 
peculiar to itself, and differing from that of the other strata 
either in colour or intensity. Some of the veins discharged a 
purple light : others a yellowish -green light ; others a whitish- 
light, and others exhibited no phosphorescence at all. The 
most singulai’ circumstance, however, was, that the different 
strata of phosphoric light preserved their boundaries sharp and 
well defined, and were far more minute and numerous than the 
strata seen by a microscopical examination of the specimen. 
'JTie discharge of the phosphorescent matter, therefore, had 
displayed an arrangement of strata which could not have been 
detected either by the optician or the mineralogist, in the same 
manner as in a piece of chalky Tabasheer of an uniform white- 
ness, a veined structure is exhibited after the partial discharge 
of the oil which it had unequally absorbed. 
In a future paper, we shall have occasion to point out the 
conclusions respecting the cause of phosphorescence which are 
indicated by this and other experiments. D. B. 
Art. XXXII. — Some ^Professor Amtci’s Discoveries 
relative to the Motion qf the Sap in Plants * *. 
3^ ROFEssoR Amict, in the course of a series of experiments 
with his newly invented catoptrical microscope, in which he em- 
ployed only very small and delicate objects, and such as seemed 
to promise some interesting discovery in respect to their organi- 
zation, made some very remarkable observations on the motion 
of the sap in the stonewort plant (Chara^ Lin.), which he com- 
municated to the public in a short treatise, afterwards inserted 
ill the 18th volume of the Memoirs of the Italian Society. 
So long ago as the year 17T4, the Abbe Cord had remarked 
a sort of circulation of the sap in this very simple plant f. With 
* Translated from Gilbert’s Annalen. 
*1* Osservazioni microscopicke svlla Tremella e sulla circolazione deljluido in una 
pianta acquajuola, deW Abate Bonaventura Corti, Prof, di Fitdca^ Lucca, 
1774. 8vo. 
