Darlington’s Memorials, §c. 85 
48-hedron. The analysis, performed like that of a silicate, fused 
with carbonate of soda, gave : 
Silica, . : : : : s » 38°85 
Peroxyd of iron, : : : : 28°15 
Lime, . ; ’ ‘ é . 32:00 
99-00 
It therefore agrees with the purest lime-iron-garnet, and its 
formula is 3CaO, SiO, +Fe, O,, SiO,. 
- Chondrodite, from New Jersey. Some very dark red speci- 
mens appearing to indicate the presence of oxyd of zinc, which 
occurs so abundantly in that mineral district, the analysis was 
chiefly undertaken to determine this point. The fluohydric acid 
was determined by fusion with carbonate of soda, and by subse- 
quent treatment of the aqueous solution by oxyd of zinc, sal-am- 
moniac, ammonia and chlorid of calcium. The results corres- 
ponded with one of Rammelsberg’s analyses and the absence of 
zine was fully proved. 'The analysis gave: 
1 : ‘ : 
Silica, ; ; é . 33°35 
Magnesia, . ; ; ‘ : = 53°05 
Protoxyd of iron, . : : ’ # J BIBD 
Fluorine, . j : 760 
99°50 
The formula is therefore MgF+2 (3MgO, SiO,), in which a 
Portion of the magnesia is replaced by protoxyd of iron. 
Arr. XIV.— Memorials of John Bartram and Humphry Mar- 
shall, with notices of their Botanical Contemporaries, by Wu. 
Darueron, M.D., LL.D., pp. 585, 8vo. Philad., 1849. 
youth ; the leisure hours of the last year and more have been de- 
Voted to collating, copying with his own hands, and editing the 
