11. 



TABLE SHOWING THE EFFECT OF THE KILLING OF 

 BREEDING FEMALE SEALS IN DIMINISHING THE 

 NUMBER OF THE BREEDING FEMALES IN THE 

 HERD. HANDED IN BY MR. PHELPS ON THE 6th 

 JULY. 1893. 



These tables are made upon the following assumptions: 



1. That the seals born in any year decrease annually at the several 

 rates indicated in the diagrams of the U. S. Commissioners (U. S. Case, 

 p. 353). 



2. That each breeding female has a breeding life of eighteen years. 



3. That each breeding female gives birth annually from and exclud- 

 ing her third year to one pup and that half of the pups are females. 



4. For a basis upon which the eftect of all the pelagic sealing from 

 1872 to 1889, inclusive, may be determined, a calculation is made in 

 Table "A" of the number of female seals which 1000 female seals, 

 divided into 250 three years old, 250 four years old, 250 five years old 

 and 250 six years old, would produce and which would remain in 

 the herd at the end of each year for the period of eighteen years, after 

 allowing for all destruction proceeding from causes other than pelagic 



sealing. This computation for 1000 is applied in Table "B " to the total 

 pelagic catch at the end of 1882, and in Table "C" to the whole pelagic 

 catch at the end of 1889. 



The percentage of breeding female seals remaining in each year after 

 suffering all losses from natural causes, as taken from the United States 

 Commissioners tables, is as follows, beginning with 100 seals: — 



1st year, 100; 2nd year, 50; 3rd year, 33^; 4th year, 24; 5th year, 

 20; 6th year, 18; 7th year, 17; 8th year, 15; 9th year, 14; 10th year, 

 13J; 11th year, 13; 12th year, 12^; 13th year, 12^; 15th year, H-i; 16th 

 year, 10^; 17th year, 9; 18th year, 7^; 19th year, 5; and 20th year, 0. 



331 



