36 
NATURAL PHILOSOPHY SECTION. 
On November 16th, 1899, Mr. J. KENT-SMITH read a Paper on “ The 
Modern Manufacture of Iron and Steel.”” The Paper was illustrated with 
Lantern Slides from photographs taken during manufacturing operations by 
the reader, who also gave his own analyses, as below, of some of the Minerals 
in the Society’s District, and referred to in his Paper. 
IRON STONES FROM NEAR DOLGELLEY. 
(1) (2) (3) 
Ferrous Oxide i ne = 34°20 % 32°23 % 36°00 x 
Ferric Oxide ifs oe are 18-91 ,, 24°54 5, 30°96 ;, 
Ferric Sulphide XE ae Eye aed Tele “477 ye 
Manganous Oxide .. ae a Trace Trace 08 ,, 
Alumina We 4 a ae TG:60.5,.1- 9°OL tn an nein 
BEINIE sre ai ri ae at 3° 7G ash nt SsOO gd aia Of es 
Magnesia ate ve ay Oe Trace Trace 80 ,, 
Phosphoric Acid... ite Be 3283 cop hake Olsen el Odes 
Insoluble silicious matters .. de 20:70 4... 19°70. 14°09) 5, 
Carbonic acid and organic matter .. Fie pre geger Men CEI cx, 


99-69 5, 99°49 5, 100°06 ,, 
NATIVE MANGANESE STONE (MANGANOUS SILICATE) 
FrRoM LLANBEDR. 
Manganese an +e as 2311 % 
Tron ° eo ° ae ats 5°20 ,, 
Silica ae aie Ac 41: ote AC Ae 27°50 45 
Moisture 5e ae re oe +5 of re 2°88 ,, 
LIMESTONES FROM MINERA, 
(1) 2 
Calcium Carbonate a oc as ‘i 96°82 Y 97°80 % 
Magnesium Carbonate ab D ae *50 5, "34 45 
Alumina peroxide of iron, &c. ae 7c 28 ,, “58 ,, 
Insoluble matters ae oy se ve 2°26 ,, D220 see 


99°86 ,, 99°92 ,, 
On February 22nd, 1900, Mr. JOHN WELSH, Ph. Ch., F.C.S., gave a 
Paper on “ Micro-Organisms, or Our Secret Friends and Foes.”’ 
The lecturer after a rapid survey of the rise and growth of Bacteriological 
Research, and its beneficial results upon Life at the present time, described 
the “Life-History” of organisms under the following heads :—Habitat ; 
Mobility ; Reproduction ; Size; Environment; Effects. 
(2) Amongst the Microbes Friendly to man were mentioned and 
described :— 
Organisms of Nitrification (Nodule Bacteria). 
Hay Organism (Bacillus Subtilis). 
Organisms of Alcoholic (fermentations) 

3 Acetic Pa 
“ Lactic 35 
a Butyric _ 
is Citric Acid i 
Digestion 
(b) Whilst amongst the Znemies of Mankind were included: the 
Chief Pathogenic Organisms ; viz :— 
Staphylococcus pyogenes aureus. 
9s os albus, 
Streptococcus pyogenes. 
Fraenkel’s Pneumococeus. 
Friedlander’s Pneumobacillus. 
Organism of Consumption Saczllus Tuberculosis. 
Organism of sagt . 8. Anthracus. 
Cholera Spirillum or sak as 
Chin fo Bacillus } Vibrio Cholere. 
Lockjaw (Tetanus) Microbe 2. Zetanz. 
Leprosy Germ B. Lepre. 
Diphtheria Organism B. Diphtheria. 
Bacteria of Suppuration 
Organisms of Pneumonia { 
