( 278 ) 
a footprint 1 foot in diameter will be practically 3 feet in circumference, 
double tins—height, 6 ft. 
Feel , cave of the.— In long marches over dry ground powdered boracic or 
boric acid dusted well in the sock, especially at heel and toe and between the 
toes of the foot, will prevent many a blister. Soap and vaseline are also good. 
Before going out snipe shooting, a good rubbing of the legs and feet with 
mustard and eucalyptus oil in equal parts is a good tip. Soaking the feet in 
strong brine, or a strong alum solution hardens them. Changing the socks 
from one foot to the other every 10 miles is a good tip. 
Filter. —The best for camp use is the Berkfield. 
Fireproofing tents, cordage and wood. — Boric acid, 6 lbs.; sal ammoniac, 
15 lbs. ; pure borax, 3 lbs.; water, 100 lbs. Mix and saturate tlie articles. 
Fish, to calculate weight Gf. — The cube of a fish’s length gives his weight 
in lbs. ; it is a rough and ready method, but it is near enough. Here is another 
formula: — Length plus one-third length, multiplied by the square of the girth, 
and divided by 1,000. As thus, — with two fish of 40 and 30 inch respectively 
it works out as follows : - 
40 + 13 (excldg. fractions ) = 53 | 53x400=21,200 139 + 13=52 
20 3 =400 j divided by 1,000 = 21 I 18- =324 
Weight of first fish, 21 lbs. Weight of second fish nearly 17 lbs. 
1 52x324=16.848 divi- 
I ded by 1000 =16*8 
