546 Dr. F. H. Hatch—L. Silurian Felsites of SE. Ireland. 
eal I. (Potash-felsites. / 
5) (lo RNB) Dy (Ql i572.) 3. (I rros)) "4-5 
SiO, PUT ORG RAL Rs iil Ones 266-28 aaa 85:2 
Al,O3 TOM e si aone NASD Biiacescees 136i ogee. ce: 
Fe203 MOM redeasieee Siatgdeseas GG} Pcossedcoa b) 
FeO HOM eaecoete Gy itaaecaaaneD BG) ei csmenae 4 
CaO ODA Seagonas8o trace ......... trace. Si cssanee trace 
MgO Teale aU ae Tele teak ae 1:8. cea 4 
ROOM Awe ceek arch egacn oleae) SOME mise tiie BG nodosenes (GM ene eA con 4:4 
Nid OF cere Sti hactaavenees Cod cea aan io eracerasr Slt wtatnicaieae HD Ag asieteieteiaeae °8) 
Loss on ignition Sane cher TOY Mosaic SY Be Aree ei ar Oe eaawemeine 6 
Total ec(iscey -sne POOre 99°6 100°1 99°8 
S05 (Elo aga. 0g 050 PEDO 2606 2°619 2°622 
Orthoclase percentage! ... 54°2 ......... Oe MEercases ACL ga eae 26-2 
Albite percentage ... ... OM bedes OADM sabae #8) Ti eee 76 
Group II. Gel soda-felsites.)? 
5. (1. 81.) 6. (I. 126.) 7. (I. 169.) 8. (I. 109.) 
SiO ae pet ass owas cscwen foseet a) COMO he seks TAPS recess (GSS) per scscnor 73°6 
AleOs . 30 MOL Oi es ech ee BQ Soane aco WPS) coscakoae 13°8 
Fe203; . (isoretor ven ORM cree = unseen 5 
HeOwe Tae Na ce HAD) ise noBdons 1000 ec » 24 
CaO . BORO Di ak WENO) | Sondecaen Ihe eoaHbaahsc 6 
MgO . aOa tea Ter ae A \yehaeeee 7 
K,0 ig eaenonaae Oy Gem ceeaunrise Bs Gel eee 4°3 
INTER OS sare Prato ohno masa aclenaoiate 7 arasenceee: DION RAS ANAS GE BO aiseeete 3°2 
Loss on ignition... B40 ja60 ROM ceiseeissis Ie deep adobe D9 Nomeaners 6 
Motale avec tel asec e rate | QOSG MeL sein OKO 238 eladaodorc 99; Sik! eee 99°7 
SP oueentccesa ah scnO4 Oueiieianians ABOD  sodooseac BABVAD  seaccaoen 2°658 
Orthoclase percentage ... 386°4 ......... Soc OAC erent 33°31 Pence 25°7 
Allbiteypercentage 55.) 1-2.) 28:81) tees. IRSA) acasaads 2OCA eae 27-1 
Ce III. (Soda-felsites.) 
(I. 83: ) 10. ° 805) ll Ge aie ) 12. (I. 96.) 
Si0, ae See senns Wo rar tiecels TIES. enna 71°6 
Al.V3 a boossdo0n nee poonddiod TOD) eras 16°9 
Fe,O3 . BU Yale sae oe CuaaCAlsd Qh aes eee 3 
FeO DOE Nits. str ASO). teshee eee doe Veeyaeoee ) 
CaO 0) eae 8h) yaaa WENGE) Sonscosoe 2°2 
MgO PIE Bodtooee *@) coanocese (HENS) copesncce 6 
K,0 DOS DeOye i ee DTN eas 13 
Na.O BA Wisbee Wee BoD niskieaictn EE ( RaRURB ANSE Ory isiecaess 4°7 
Loss on ignition .. SPS eral hid We ar SOM e se tise AB Seocosoge 1-1 
Total ee uiancetnl pe sen OOS 100°2 OB)7/ 99°6 
(yOu Ch! oda? lacdy! ooo AROOY 2°606 2°634 2°607 
Orthoclase percentage ... 13:0 LIL) 12°5 8°5 
Albite percentage ... ... 30°6 39°9 43°2 39°9 
1 The whole of the potash has been calculated as orthoclase from the formula 
K,0. Al,O3. (Si0),; and the soda as albite from the formula Na,.O. Al,03. (SiQ.)¢. 
2 See also three analyses of felsites from the counties of Wicklow, Wexford, and 
Watertord by the Rev. 8. Haughton (Trans. Roy. Irish Acad. vol. xxiii. part li. 
1859, p. 615). 
3 See also two analyses of soda-felsites from the Waterford coast by the late J. A. 
Phillips (Phil. Mag. 1870, vol. xxxix. p. 12; Gon. Mac. June, 1889, p. 288), and 
an analysis of a Wicklow soda-felsite by the ‘author (Gzou. Mag. Feb. 1889, p. 70). 
