CONTENTS. 
. On the Phenomena of the Scratched Rock Surfaces. 
By THeopore KserutF; with a Notice of the Post- 
Pliocene Fossils of Southern Norway. By Dr Sars, 
Professor of Natural History, Christiania, 
. Note on Lemania variegata of Agardh, By Georce 
Lawson, LL.D., Ph.D., Professor of Chemistry and 
- Natural History in the Queen’s University of Canada, 
. Descriptions of New Genera and Species of Diatoms 
from the South Pacific. By R. K. Grevitiz, LL.D., 
wie. H,,, we. ‘(Plate 1), . 
. On the question, Is Oxide of Arsenic, long used in a 
very small quantity, injurious to Man? By Joun 
Davy, M.D., F.R.SS. Lond. and Edin., 
. Illustrations of the Significance of certain Ancient British 
Skull Forms. By Danisx Winson, LL.D., Professor 
of History and English Literature, University College, 
Toronto, 
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