198 
Scientific Intelligence* 
Felspar, . . KS^+SAS^ 
Albite, . . NS3+3AS5 
Labradorite, . NS^ + 3 CS5 + 12 AS 
Anorthite, . . MS + 2 CS + 8 AS 
Of these, Felspar is said to occur most commonly ; Albite, be^ 
sides the Swedish localities, is mentioned from Arendal, from 
several places in the Alps, from Kerabinsk in Siberia, Scotland, 
&c. ; Labradorite is noticed from the coast of Labrador, and from 
Ingria^ Anorthite has hitherto been found only in blocks of 
limestone from Monte Somma. 
We understand that almost a year before the publication of 
this paper, M. Mohs and M. Haidinger had obtained nearly 
the same results as to the differences prevailing among the 
forms, specific gravity and other properties of these substances, 
and considered them accordingly as different species (Edin- 
burgh Philosophical Journal, No. XVI. p. 287.), with the 
exception only of Anorthite. But they observed some difference 
in the angles of certain tetarto-prismatic varieties from the Alps, 
and in their specific gravity, which is between 2.5 and 2.6, and 
very likely may lead to the establishment of another species. 
The last of these is probably the same as that which has been 
observed by M. Breithaupt of Frey berg, in some varieties from 
Toplitz, in Saxony, and of which he intends to give a full de- 
scription in a particular paper on these substances. Messrs 
Brooke, Levy, and Phillips, have likewise ascertained the dif- 
ference between some of the above mentioned species ; and Mr 
Brooke has given the name of Cleavelandite to what formerly 
had been called Albite. From the united labours of so many 
mineralogists, directed towards the same object, w'e may expect 
in a short time to become more intimately acquainted with these 
substances ; and we are perfectly convinced, that it would be a 
matter of the highest importance to join with these inquiries 
such as are directed towards their optical properties. 
ZOOLOGY. 
30. The Woodcoch — Our friend Major Morison remarks in a 
letter to us, that there are “ few birds among the migratory class, 
whose character, under this head, invites a greater field for specu- 
