37

that observational error tends to lessen as the columns pass from right to left
whilst observations of different observers are comparable. (Vide Chapter XIV.)

  Infects
over 100
per 100
fields.		 Infects
over 20
per 100
fields.		 Infects
over 5
per 100
fields.		 Infects
under 5
per 100
fields.		 Nega-
tive.		 Percent-
age in-
fected.		 Spleen
rate.
Khazana             1 9 6 10 10 76% 93
Mahan Singh           .. 1 9 5 8 66% 90
Jamal Singh, 75—50 zone       1 3 4 4 6 65% 66
Hati Gate, 75—50 zone       1 3 6 1 11 50% 47
Kanyan, 75—50 zone         .. 2 2 1 5 50% 54
Tunda Talab, 50—20 zone       .. .. 1 2 4 43% 37
Chauk Pasian, 50—20 zone       .. 1 6 1 15 34% 37
Chowrasta Atara, central zone     .. 1 .. 4 14 26% 13

       Considered in regard to the species of parasite found the results were as
follows:—

  Simple
tertian.		 Malignant
tertian rings.		 Crescents. Quartan.
Khazana               24 2 4 2
Mahan Singh               11 1 3 4
Jamal Singh               11 0 2 0
Hati Gate               11 0 0 0
Kanyan               5 0 1 0
Tunda Talab               3 0 0 0
Chauk Pasian               8 0 2 1
Chowrasta Atara             5 0 1 0
          TOTAL   78 3 13    7

Breeding places of Anopheles at Amritsar.

      Breeding places outside the city.—The accompanying map (Map III) shows
the places in which anopheles have been found breeding within and around
Amritsar.