The Victorian naturalist . The narrowness of this great gorge,its depth and direction, have producedin it a unique micro-climate. Air-borne spores, carried for perhapshundreds of miles, have settled andgerminated to produce this place ofentrancing beauty and botanical in-terest. The following fern species have beenrecorded from Castle Rock Gorge: Hymenophyllum cupressiforme Common Filmy-fernMecodium flabellatum Shiny Filmy-fernMecodium rarum Narrow Filmy-fernPolyphlebium venosum Veined Bristle-fernDicksonia antarctic a Soft Tree-fernHistiopteris incisa Bats-wing FernGrammitis billardieri Finge
The Victorian naturalist . The narrowness of this great gorge,its depth and direction, have producedin it a unique micro-climate. Air-borne spores, carried for perhapshundreds of miles, have settled andgerminated to produce this place ofentrancing beauty and botanical in-terest. The following fern species have beenrecorded from Castle Rock Gorge: Hymenophyllum cupressiforme Common Filmy-fernMecodium flabellatum Shiny Filmy-fernMecodium rarum Narrow Filmy-fernPolyphlebium venosum Veined Bristle-fernDicksonia antarctic a Soft Tree-fernHistiopteris incisa Bats-wing FernGrammitis billardieri Finger FernMicrosorium diver si folium Kangaroo FernAsplenium flabelhfolium Necklace FernAsplenium bulbiferum Mother SpleenwortRumohra adiantiformis Leathery Shield-fernPolystichum proliferum Mother Shield-fern Acknowledgement I am indebted to Mr. A. C. Beaugle-hole for his assistance with identifica-tions and for confirmation of therecords listed. Veined Bristle-fern {Poly-phlebium venosum) growingon wall of Castle 160 Vict. Nat.—Vol. 85 Radiocarbon Dating by Edmund D. Gill* From outer space there is a con-tinuous rain on the earth of all man-ner of particles. This cosmic radia-tion was discovered in 1911. We areprotected from it by the atmosphereabove us. The radiation causes changesin the atmosphere, and one of theseis to change nitrogen atoms (atomicweight 14) into carbon atoms (atomicweight 14). There are two differencesbetween ordinary carbon atoms andthose caused by cosmic radiation. Or-dinary carbon atoms are lighter(atomic weight 12), and those formedin the upper atmosphere are radio-active. The radioactive carbon formedin this way unites with oxygen in theatmosphere to form carbon dioxideupon which plants live. Because ani-mals live on plants, the radioactivecarbon becomes distributed throughthem also. You and I and all livingthings thus contain radioactive carbon. The amount of radioactive carbonin living things has altered in recentcenturies. First of all i
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