^{page 412 note 1} Such are the Algonkian sedimonts represented by the Huronian and Algonkians of America, the Algonkiaus of Scandinavia, the Karelian of Finland, the Briovarian of North-West France, the Heathcotian of Australia, the Transvaal and Swaziland systems of South Africa, the Dharwar and Bijawar systems of India, the Itacolumnite series of Brazil, etc.

^{page 413 note 1} As shown by the work of Professor Howchin, of Adelaide.

^{page 414 note 1} The weights are given in pounds avoirdupois. For the calculation I am indebted to Mr. W. R. Wiseman, of the Geological Department of Glasgow University.