38 REPORT—1845. 
Table of Analyses of three of the most common Fuci. 
I. Results as obtained from 100 parts of Ash. 
Ingredients. Laminaria Fucus Fucus 
saccharina. | vesiculosus. | serratus. 
Potassatctivorcctes ves cststavestersevesbes sa 22°456 17-409 14°925 
HOdawcrtscccccecoereaks sess a¥eunhes aeeiedaes 1:667 5688 5:597 
Lime ...... consults «ie Me castes weeeeice 10:042 7°368 9-076 
Magnesia ...csscecsscsseae: seeseeseesanees 7374 6°786 7-076 
Chloride of sodium ...... Generettesscaes 30°579 34°839 36:083 
Todide of sodium .....,..seeneesesseseees 4:257 0-129 0-249 
Phosphate of peroxide of iron ......... 0-683 0°350 0°599 
Phosphoric acid......ssssesecsecseeseeeres 3-474 2:273 2-100 
Sulphuric acid ........seceeeeee BI oe: 9-611 23°353 17°101 
Carbonic achdvecsancreercerececnes cee scene 9-737 1-220 6:°375 
SICA yee taste vocctnr rate S oseckagaasans6or 0°526 0-278 0°374 
Charcoal and sand ........ Fe RO. 0°341 0-111 0:225 
"ROGAN eee tes ces cccnes 100°747 99-804 99:780 
II. The above results in 100 parts of Ash, deducting Carbonic Acid, Charcoal 
and Sand. 
POtASED oh adeden eacestiossetncs cece seme ton 24-768 17:679 16:017 
WIGU A wages donee vaneaneatsecwengat=cnschee 1:839 5°776 6:006 
Lime ...... eeshEn ame Nast seine snaeampieassis cr 11-076 7482 9°744 . 
Magnesia ..+..++++. eanaaents war uct cnmeSeay 8-133 6892 7:594 
Chloride of SodiUM  wecosscssecesesececes 33°722 35°380 38°724 
Iodide of sodium ..... ipadbehss FP neni tee 4:695 0°130 0-267 
Phosphate of peroxide of iron ,........ 0:753 0°356 0°642 
Phosphoric acid.......+-...+++ LAS 3°832 2°308 2°253 
Sulphurie Achy vacsevecstsadensesessany se 10°601 23°715 18°352 
DINICH, Sea saseaesndetas srmcniees tustaneue stents 0:581 0-282 0°401 
Total ...... ae Susaslen 100°000 100:000 100°000 
9°785 20°560 25'830 
Per-centage of ashes derived from 
Fuens dried at 212° F............. 
On the Composition of Slate Rocks, and the Soils formed from them. 
By J. P. Norton (Connecticut). 
The analyses were undertaken at the suggestion of Prof. Johnston, with a view of 
determining how far rocks of the same formation varied in different strata as to their 
chemical composition. ‘The specimens were seven in number, collected in Wigton- 
shire, 
In slate No. 1, the quantity of carbonate of lime was very great, 12°50 per cent., 
it being intersected with small veins of it; in No. 2, it was 0-40; in No. 3, 8°75; in 
No. 4, 0°45; in No. 5, 0°39; in No. 6, 0°30; in No.7, 0°34. The magnesia is more 
uniformly in considerable quantity :—No. 1, 3°80; No.4, 2:15; No.5, 1°66; No.7, 
3:09. ‘he proportion of soluble iron and alumina is generally large :—No. 2, 19°5; 
No. 3, 18°75; No.6, 12°13.; the others are smaller, Thus much for the portion so- 
luble in acid. In the insoluble portion, the same substances were always present, 
but the lime generally in sma!l quantity; in No. 1 alone was it more than 1 per 
cent. The magnesia, on the other hand, frequently increased, being in No. 1, 2°30; 
No.5, 2°90; No. 6, 3°04; gNo. 7, ‘279. ‘This was also the case with the iron and alu- 
mina. In No. 2 it was 15:3; in No. 4, 9:45; in No. 5, 21°49; in No. 6, 39°41; in © 
No. 7, 13°61. With these great variations, from 9 to nearly 40, the silica of course 
a 
