71 
In these it appearsjthat the values of K are approximating 
to the value *825, hut the great differences show that the 
temperature effect is far from having become steady, and 
are quite sufficient to explain the discrepancies in the actual 
values of K. There is thus no reason to doubt but that 
'825 is about the real value of the cofficient of contraction 
for the orifice and that the experimental results are quanti- 
tatively in accordance with the theory. 
Pipe No. 1. — Water (see fig 2a, page 61). 
Pipe No. 2 . — Gas. 
Ti + 461 
32 + 461 
Air. 
V„ = 2-413 (feet per sec.) 
/T 4- 4H1 
997 (feet per sec.) ^ ^2Tl6i 
MICROSCOPICAL AND NATURAL HISTORY SECTION. 
Ordinary Meeting, November 9th, 1885. 
Dr. Alcock, President of the Section, in the Chair. 
The Honorary Secretary having reported to the Section 
the resolution of the Council of the Section appointing Mr. 
J ohn Boyd an additional Secretary thereto ; the resolution 
was confirmed. 
