278 ’ Experiments on Allanite. 
P. S.—Some may wish to know, that 
{ the semitone subminimis = 2t— F—S= 2°514561 x@ 
25°165387 x =. 
€ Ri minor comma .... =2S—T = 10°0078624 X= 
= *3976837 x {: and, 
>the schisma ......... = eT = t—2S = = -0999204 x@ 
= °039073712x f. 
The schisma-excessive minor Fourth 5f + 129@ + 10%, 
belongs to the scale of my Equal Temperament (mentioned 
in your 28th volume, p. 65; 35th volume, p. 452; and 
36th volume, p. 48), and exceeds the true Isotonic Fourth 
or 48sths of the octave, by only about the +sj578t part of a 
major comma: it is equal 3V +111 — 44ths, and is tuned, 
or may be proved on this organ, by trying C, G D A‘ and 
xC upwards and thence xG’, ay, ¥ A’ and aE’ downwards, 
when C will be found to beat with this last note, 1°0836 
times per second, if C of the tenor cliff line on the diapason 
stop vibrates 240 times per second, according to the true 
concert pitch.—J. F. 
XLVIII. Experiments on Allanite, a new Mineral from 
Greenland. By THomas Tuomson, M.D.F.R.S. Fel- 
low of the Imperial Chirurgo- Medical Academy of Pe- 
tersburgh*. 
Asovr three years ago, a Danish vessel ¢ was brought into 
Leith as a prize. Among other articles, she contained a 
small collection ef minerals, which were purchased by 
Thomas Allan, Esq. and Colonel Imrie. The country from 
which these minerals had been brought was not known for 
certain ; but as the collection abounded in cryolite, it was 
conjectured, with very considerable probability, that they 
had been collected in Greenland. 
Among the remarkable minerals in this collection, there. 
was one, ‘which, from its correspondence with gadolinite, as 
described in tlie different mineralogical works, particularly 
attracted the attention of Mr. Allan, who was confirmed in 
the idea of its being a variety of that mineral by the opinion 
-of Count Bournon, added to some experiments made by 
Dr. Wollaston; and he was thus induced to give the de- 
scription which has since been published in a preveding 
part of the present volume. 
* From the Transactions of the Royal Society of Edinburgh. 
+ Der Fruhling, Captain Jacob Ketelson, captured on Gee passage from 
Iceland to Copenhagen. 
About 
Ce Se Pt a 
a Ge 
ad sil ial cineg 
