Through the courtesy of Professor J. W. Spencer, I haveX received an early copy of his paper on the “ Great Changes ofLevelinMexico and the Interoceanic Connections,“' containing theobservations and conclusions derived from a visit paid to this regionin 1895, with the special object of determining on the spot whetherthe suggestion that the drainage of what is now the Gulf of Mexicoformerly crossed the Tehuantepec Isthmus into the Pacific.

In a previous paper I ventured to emphasize the opinion, now verygenerally held, that, whether by a gradual process or spasmodically, the Northern and Central parts of Scandinavia, have beenrising from the sea-level since Tertiary times, and that, so far as weknow, this rise has not been interrupted by intervals when themovement has been one of depression.

In a former number of this Magazine the evolution of the subgenera of the single genus Cheirurus has been discussed, andit is now proposed to examine the mutual relations of the other genera of the Cheiruridæ. Some diversity of opinion has existed as to the genera which may be grouped together to form this family.

This is undoubtedly the most difficult district to deal with, and one in which I have had to change my views on certain details. Still, there is one part of it where the evidence is very clear, namely, the ground between the railway and the road at the Tan-y-pant inlet.