Vol. 6, 1920 PHYSIOLOGY: H. SHAPLEY 209 
TABLE II 
Relation of SpkEd to Size and Direction of Travel 
INTKRVAI, Oi^ 
TEMPERATURE 
1 
Total 
DUMBER OF OBSE 
Inbound 
Workers 
RVATIONS 
Major Workers 
Mean 
of 
i — 0 
Mean 
of 
M - m 
Fast 
Slow 
Fast 
Slow 
O.Olv 
O.Olv 
Station A 
38.5° to 30.5° 
10 
2 
8 
4 
5 
—2.2 
+ 1.7 
30.5 to 22.5 
5 
2 
3 
3 
1 
+0.2 
+2.2 
22.5 to 14.5 
13 
8 
3 
5 
7 
+3.5 
+0.7 
Total range 
28 
12 
14 
12 
13 
+0.8 
+ 1.3 
Station Y 
18.6 to 9.0 
12 
4 
8 
11 
0 
—2.1 
+8.7 
table III 
Observations of Temperature and Average Frequency for 4570 ants 
Ob- 
serva- 
tion 
Date 
(1919) 
TIME 
(P S. T.) 
TEMP. 
(cent.). 
INBOUND 
outbound 
Ratio of 
fre- 
quencies 
Ni/No 
Number 
Fre- 
quency 
K umber 
Fre- 
quency 
No 
L 4A 
May 25 
0:55 P.M. 
37° 
150 
0.95 
150 
1.14° 
0.83 , 
L 8C 
3:46 P.M. 
34.5 
250 
1.58 
250 
1.33 
1.19 
LllA 
5: 15 P.M. 
21.5 
250 
2.05 
250 
1.27 
1.61 
L14A 
8:40 P.M. 
16 
150 
1.32 
150 
1.04 
1.27 
LISA 
10:30 P.M. 
15.5 
100 
0.88 
100 
0.65 
1.35 
L18A 
26 
1:37 A.M. 
14.5 
150 
0.80 
150 
1.21 
0.66 
L19A 
3:59 A.M. 
14 
250 
0.94 
250 
0.82 
1.15 
L21A 
0:56 P.M. 
38.5 
125 
0.44 
125 
0.42 
1.05 
L24A 
27 
2:35 A.M. 
17 
125 
0.87 
125 
0.48 
1.81 
L26A 
11:10 A.M. 
36 
100 
0.41 
100 
0.86 
0.48 
L30A 
5:00 P.M. 
25.5 
200 
1.42 
200 
1.27 
1.12 
L34A 
8:25 P.M. 
20 
150 
1.14 
150 
1.36 
0.84 
L37A 
28 
9:30 A.M. 
19.5 
110 
0.74 
110 
0.70 
1.06 
L45A 
June 4 
4:51 P.M. 
25.5 
100 
0.85 
100 
0.85 
1.00 
L51A 
5 
10:12 A.M. 
23 
50 
0.20 
100 
0.76 
0.26 
In order to determine the relation of number of ants running to time of 
day and to temperature, the series of observations were made at station 
A which are recorded in table III and summarized for time of day and 
temperature in tables IV and V. The frequencies Ni and Nq show the 
average number of inbound and outbound ants passing a given point on 
the trail per second — a quantity obtained by dividing the number of ants, 
fifth and seventh columns, into the intervals of time required for their 
passage. When the ratio Ni/No exceeds unity, more ants are going in 
