ON THE PURIFICATION OF BEET JUICE, &C. 151 
petiolo sublongioribus, pedunculis bilobo, squamulis nectareis subcla- 
hinc linea puberala notatis, labello vatis. 
late obcordato, squamulis nectareis 
nullis. 
Specific differences of Ionidium Specific differences of Ionidium 
Marcucci, as compared with Parvifiorum, as compared 
Ionidium Parvifiorum. with Ionidium Marcucci. 
Stem undershrubby, procumbent, Stem shrubby, diffuse, leaves 
tubulous, leaves ovate, with the ovate, stipules rather shorter than 
apex of their teeth glandular, sti- the petioles, peduncles smooth, la- 
pules rather longer than the peti- bellum ovate, two-lobed, nectareous 
oles, peduncles pubescent on one scales subclavate. 
side, labellum broadly obcordate, no 
nectareous scales. Jamaica Phys. Journ. 
ART. XXII.—ON THE PURIFICATION OF BEET JUICE, AND 
A METHOD OF PREPARING IT IN THE BEST MANNER. 
By M. Pelletan. 
Having for the last two years paid much attention to the 
subject of beet sugar, and the best methods of making it, I 
have become acquainted with the most scientific manufac- 
turers, and have visited many of their establishments, and 
more especially that at Boistrancourt, under the direction of 
M. J. Castelyen. 
I soon perceived, in a practical study of this new branch of 
industry, that the great difficulties were in the clarification of 
the juice and in the boiling. The first of these is accomplished 
by the addition of slacked lime, which is mixed with the juice 
just before it comes to the boiling point, and continuing the 
heat till ebullition commences. By this a scum is produced, 
which rises to the surface, whilst at the same time a precipi- 
tate is formed, leaving the intermediate fluid more or less clear 
and coloured. It is judged that the clarification is successful, 
1st, when the scum is consistent; 2d, when the precipitate 
