182 Transactions.—Miscellaneous. 
of the lake during the 17th and 18th November. This quantity is equivalent 
to a depth of 1:489 inches per diem run off the whole drainage area. 
The observed rainfall at Queenstown during the two days being 2:27 
inches or 1:135 per diem, of which we can only count upon three-fourths 
as having run off (this being the proportion observed to do so in similar 
districts in Europe) we can only attribute -851 inch over the whole area to 
rainfall Consequently the difference must be derived from the melted snow 
and ice running from the mountains. 
I may observe here, that Queenstown being nearly at the centre of the 
drainage area, the registered rainfall may be taken as a fair average; and 
that at the late period of the season when this flood occurred, the snow 
on the mountains immediately surrounding the lake had almost entirely 
disappeared 
The following table will give the above results more clearly :— 
i lent depth 
— per cadena Cubic iid pe off per deg 
square mile. parum 
Rainfall ka e Ex 1,978 1,647,600 "851 
Snow .. vs zm is 950 1,140,000 *588 
TOTIS. -— lu e 2,8393 | 2,787,600 1:439 
From the above figures we can approximate the proportion of the flood- 
water running into the head of the lake by the rivers Dart and Rees :— 
- Sq. MILES. 
Rainfall .. ek RA e vc L90 x 400 — -— 549.000 
Snow  .. e am e. "m 950 x 1,200 — 1,140,000 
Toran Cusic FEET PER MINUTE .. ,000 
As in the former table it was shown that the total Mete: amounted 
to 2,787,600 cubie feet per minute, it is evident that eonsiderably more 
than half the whole quantity rushed into the lake at the extreme north 
end, or head as it is termed. Accepting these to be the facts, the question 
is,— Would this mass of water flowing rapidly (possibly in much less than 
forty-eight hours) into one extremity have sufficient effect to cause the 
disturbance observed ? 
I have been unable to find any other explanation, and believe that the 
following are the reasons. I would ask you to examine the conformation of 
the lake, and observe that it is throughout a long and narrow one, and that 
opposite Queenstown there are two bends or elbows of more than right 
angles; in point of fact, a wave passing down the lake would be deflected 
