336 NATURAL SCIENCE [November 
Out of this deposit I have myself taken three well-formed stone 
spear heads of the ‘ Moustier’ type. They were at the level of low 
water, and in a position where they must have at one time been 
covered by 180 feet of the deposit. One of these is still in my 
possession, one is in the Albany Museum, and the third was given 
to a friend, who subsequently sent it to Sir John Lubbock. These 
aeolian deposits extend, so far as my own observations go, to a dis- 
tance of certainly one mile into the ocean from the present shore. 
Between Sand Hill and Bats’ Cave the low water platform has been 
cut back in many places for a width of over 200 yards by wave 
action. A visit to Cove Rock on a calm day will verify this if one 
stands on the larger of the two masses forming the rock-face on the 
south, for there one will see a similar platform, only at a much 
lower level, extending as far as the eye can follow it. The sub- 
merged reef off Nahoon Point is of this aeolian formation, and the 
sea has been observed to break on it upwards of a mile from the 
shore, while the Sisters and Fountain Rocks are really small isolated 
masses three-quarters of a mile from present low-water line. About 
one-third of the distance from the Sand Hill to Bats’ Cave there 
is an isolated mass of this formation which becomes an island at 
high water; on the land-face of this mass there is a heap of shells 
embedded 12 feet above high-water mark. This is about 12 feet 
long by 3 feet thick, and contains, besides shells, fish bones and 
splintered bones of mammals; and although there are no traces of 
ashes or charred wood, I am satisfied myself as to its artificial 
deposition. : 
The facts concerning the aeolian deposit enumerated above leads 
us to the following conclusions. Since the three spear heads were lost 
we have to account for a depression of the land and advance of the 
shore-line for at least a mile, and from the average inclination of the 
bed of the Indian Ocean at this point, that means a land depression 
of over 50 feet. Then we have to allow for the gradual emergence 
of the land, which has enabled the sea to cut the rock back for a 
distance of a mile, up to its present level, which it has maintained 
long enough for the sea to cut a platform over 200 yards in width. 
Gro. R. M‘Kay., 
East Lonpon, W., SouTH AFRICA. 
