In order to discover whether the distribution of the
dancers among the three groups which have been designated
as right, left, and mixed whirlers agrees in general
with that indicated by Table 4 (approximately the same
number in each group) I have observed the direction
of turning in the case of one hundred dancers, including
those of the foregoing tables, and have classified
them in accordance with their behavior as is indicated
below.
RIGHT LEFT MIXED
WHIRLERS WHIRLERS WHIRLERS
Males 19 19 12
Females 12 23 15
Totals 31 42
27
The left whirlers occur in excess of both the right
and the mixed whirlers. This fact, together with
the results which have already been considered in
connection with the counts of turning, suggests that
a tendency to whirl in a certain way may be inherited.
I have examined my data and conducted breeding experiments
for the purpose of ascertaining whether this is true.
But as the results of this part of the investigation
more properly belong in a special chapter on the inheritance
of behavior (XVIII), the discussion of the subject
may be closed for the present with the statement that
the preponderance of left whirlers indicated above
is due to a strong tendency to turn to the left which
was exhibited by the individuals of one line of descent.
AVERAGE NUMBER OF WHIRLS TO THE RIGHT AND TO THE LEFT
FOR
THE SIX INTERVALS OF TABLES 2 AND 3, WITH A CHARACTERIZATION
OF THE ANIMALS AS RIGHT WHIRLERS, LEFT WHIRLERS, OR
MIXED WHIRLERS.
AVERAGE NO. AVERAGE NO.
MALES AGE OF WHIRLS OF WHIRLS CHARACTERIZATION
2 12 mo. 136.7 3.3 Right whirler
30 2 mo. 109.7 2.5 Right whirler
34 2 mo. 4.3 96.5 Left whirler
36 2 mo. 197.5 23.5 Right whirler
152 6 mo. 6.8 137.0 Left whirler
156 1 mo. 73.2 12.8 Right whirler
210 3 mo. 78.7 62.0 Mixed whirler
220 4 mo. 74.3 40.2 Mixed whirler
410 3 mo. 10.3 139.0 Left whirler
420 3 mo. 12.2 241.3 Left whirler
Average 70.4
75.8 4 Right whirlers
4
Left whirlers
2
Mixed whirlers
