IOWA ACADEMY OP SCIENCE 
21 
Months 
Number of 
observing 
days 
Groups 
1 
Average 
number of 
spots 
Faculae 
Average 
north lati- 
tude 
Number 
groups 
south lati- 
tude 
Number 
spotless 
days 
1903. 
January 
12 
0.60 
3.60 
0.60 
0.25 
0.33 
5 
February 
16 
1.30 
3.50 
1.30 
0.50 
0.80 
1 
March 
15 
1.47 
7.01 
1.30 
1.20 
0.27 
5 
April 
.8 
2.06 
7.40 
1.90 
1.10 
0.96 
2 
May 
18 
l.bO 
5.80 
2.00 V 
0.67 
0.62 
4 
June — 
^8 
1.48 
7.30 
2.00 
0.56 
0.87 
2 
July 
26 
2.15 
12.60 
2.15 
0.8b 
1.30 
1 
August 
21 
1.48 
8.10 
2.40 
0.43 
1.04 
0 
September 
21 
0.67 
2.43 
1.90 
0.43 
0.24 
11 
October — 
26 
1.96 
10.54 
1.65 
0.96 
1.00 
0 
November 
19 
2.47 
15.00 
2.16 
0.63 
1.84 
0 
December 
15 
2.93 
11.07 
3.20 
1.20 
1.73 
1 
1904. 
January 
10 
2.70 
13.75 
3.14 
1.50 
1.20 
0 
February _ 
15 
1.73 
7.71 
2.43 
1.10 
0.60 
0 
March 
14 
3. SO 
11.21 
2.21 
2.10 
1.20 
0 
April : 
11 
2.82 
9.45 
2.70 
2.20 
0.60 
0 
May 
9 
3.78 
14.10 
3.90 
2.00 
1.80 
0 
June 
12 
3.17 
16.75 
3.10 
1.60 
1.40 
0 
July 
21 
3.14 
17.62 
3.20 
1.80 
1.30 
0 
August 
20 
3.85 
17.20 
3.75 
1.80 
2.00 
0 
September 
15 
1.67 
6.73 
2.70 
0.70 
1.00 
0 
October 
13 
3.54 
16.31 
3.54 
1.90 
1.60 
0 
November 
20 
3.30 
11.70 
3.50 
1.40 
1.80 
0 
December 
12 
4.25 
16.50 
3.50 
2.90 
1.30 
0 
1905. 
January _ 
11 
4.10 
15.45 
3.60 
1.70 
2.30 
0 
February 
17 
4.77 
18.80 
4.40 
2.40 
2.40 
0 
March 
12 
3.60 
18.30 
4.30 
2.00 
1.60 
0 
April 
12 
2.90 
11.50 
3.70 
1.40 
1.40 
0 
May 
17 
3.20 
14.51 
4.30 
2.10 
1.10 
2 
June - 
16 
3.50 
13.88 
4.20 
1.60 
1.80 
0 
July 
24 
4.30 
21.79 
3.80' 
1.70 
2.60 
0 
August __ 
23 
5.00 
16.00 
4.30 
3.50 
1.50 
0 
September 
17 
3.40 
14.00 
2.80 
2.00 
1.20 
0 
October 
20 
3.90 
24.30 
4.00 
3.00 
0.85 
0 
November 
17 
5.80 
34.00 
3.90 
3.80 
2.00 
0 
December 
16 
3.60 
15.60 
4.00 
1.90 
1.80 
0 
1906. 
.Tanuarv 
11 
4.10 
15.00 
4.00 
2.50 
1.60 
0 
February 
10 
2.80 
7.10 
3.50 
2.20 
0.60 
0 
March _ 
7 
4.70 
16.60 
4.00 
2.60 
2.10 
0 
April __ 
15 
4.00 
16.30 
3.90 
3.00 
1.00 
0 
May __ ‘ 
22 
3.50 
• 15.80 
3.00 
3.00 
0.50 
0 
June 
23 
4.20 
17.00 
3.30 
3.40 
0.80 
0 
July 
25 
7.10 
25.10 
3.50 
5.50 
1.60 
0 
August 
23 
3.30 
10.90 
3.10 
1.70 
1.60 
0 
September 
21 
3.70 
14.00 
2.90 
1.90 
1.80 
0 
October _ 
20 
1.00 
4.60 
3.00 
0.30 
0.70 
8 
November 
10 
3.10 
13.20 
2.40 
1.70 
1.40 
0 
December 
1 11 
4.30 
23.80 
3.10 
3.00 
1.30 
0 
1907. 
January _ 
8 
5.2 
22.2 
4.0 
3.7 
1.5 
0 
February 
12 
6.5 
29.0 
3.7 
3.5 
3.0 
0 
March 
16 
4.0 
13.4 
3.6 
2.0 
2.0 
0 
April 
13 
3.3 
13.5 
2.8 
2.1 
1.2 
0 
May 
15 
2.5 
8.0 
2.9 
1.1 
1.3 
0 
.Tune 
22 
2.0 
10.2 
3.0 
0.9 
1.1 
0 
July 
26 
3.2 
13.4 
2.9 
1.2 
2.0 
0 
August 
23 
4.0 
13.5 
3.0 
1.3 
2.7 
0 
September 
13 
4.8 
21.7 
3.8 
3.1 
1.7 
0 
October 
22 
3.7 
17.6 
3.6 
1.5 
2.2 
0 
November 
20 
3.2 
16.3 
3.8 
1.5 
1.7 
0 
December 
15 
2.9 
10.9 
3.2 
0.7 
2.2 
0 
