388. Dolomite, vol. vii, 1 ; barite, p. 253 ca 
| ie 97. 
Geology and Natural History. 481 
I shall determine the same angle for anorthite when I apg to 
aris. 
4, she ee Mineralogiche per servire alla Storia dell? 
Incendio —— del Mese di Aprile, 1872, memoria di Arcan- 
GELO Scaccut. Parte seconda, 69 pp. quarto. Naples, 1874.— 
The first nek of Scacchi’s valuable memoir on the eruption of 
d 
sylvite and "acs sal ammoni ite, chlorocaleite, 
cotunnite and pseudocotunnite, er wy ih olisite, ene 
magnesite, chloralluminite, aphthitalite, anh cupromag- 
nesite, chlorothionite, microsommite, pyroxene, bystlite ae 
worite, ee, chrysolite, apatite. of t 
species are — n italics; their principal sbaxnotens are ites 
changed from black to green. Its composition is spas en As 
the formula 2Cn0, CuCl+3HOo. 
ryp tohalite; a fees of oe <a entie with sal 
"aaa kr ; composition Al? xHO, traaera with 
molisite, and chloromaguesite ; ee on exposure to the air. 
Chlorothionite , fou crusts of an Se color, an anal- 
5 -y i ” p- 
salar p- 307; gold, p- 321; pan P: —. perofskite, p. 
cite, p. 59; _cracoite, 
D. 
Memoire sur la Famille des Pomacées ; par J. Decatssx.— 
A Getaited analysis of Decaisne’s monograph of the genus 
was given in this Journal (8rd ser., iv, 489, Dec., 1872). Some of 
Views taken in that work are fully expounded in the present 
Paper , which is separately issued from the Archives du Museum, 
