The distribution of bergs found has been shown in charts appear- 

 ing in the bulletins of this series reporting the work of those years. 

 Wliile two censuses are inadequate to fix the travel time there is some 

 evidence that it is 3 years. If we assume a 3-year travel time, and 

 and divide Baffin Bay into areas A, B, and C being guided by the 

 distribution found and by what is known of the circulation in Baffin 

 Bay; then the bergs found in area A may be assumed to represent 

 those calved the year of the census, those found in area B those calved 



1 year before the census, and those found in area C those calved 



2 years before the census and to appear in the Grand Banks region 

 the year following the census. Such a division has been made to 

 define area A as easterly of a series of rhumb lines drawn from 66° 

 N., 56° W., to 70° N., 56° W., to 70° N., 60° W., to 71° N., 60° W., to 

 71° N., 62° W., to 72° N., 62° W., to 72° N., 64° W., to 74° N., 64° W., 

 to 74° N., 70° W., to 75° N., 70° W., to 75° N., 66° W., and thence 

 north to the Greenland coast; area B as northwesterly of this boundary 

 and a series of rhumb linos beginning at 72°N., 64° W., and con- 

 tinuing to 72° N., 66° W., to 71° N., 66° W., to 71° N., 68° W., and 

 thence south to the coast of Baffin Island; and area C as southerly 

 of areas A and B and bounded on the south by the 66th parallel. 



Since the visual and photographic counts made in 1949 of the bergs 

 in area A were 14,206 and 33,962 the visual count of bergs in this 

 area in 1948 was adjusted ])y a factor of 2.4. Visual and photographic 

 counts of the bergs in area B in 1949 were 2,788 and 4,933 giving a 

 factor of 1.8 for the adjustment of the visual count of bergs in area 

 B in 1948. As there was agreement between the two counts of the 

 bergs in area C in 1949, the visual count of bergs in this area in 1948 

 was not adjusted. The resulting numbers of bergs are tabulated 

 below: 



If the bergs appearing in the Grand Banks region 1 year were in 

 area C the previous summer and in area B 2 years earlier and in area 

 A 3 years earlier, then during the interval between 1948 and 1949 the 

 survival rates were: 



AtoB=4^=21.2% 



B to C 



23258 



1337 ^ 



^2682~ 



49.9% 



90 



