Adequacy of Envelope Supply 
As discussed in the section on procedures, the number of 
envelopes sent to each hunter depended on the number of ducks he 
had reported in the Mail Questionnaire Surveys To learn whether 
hunters received enough envelopes, the per cent of respondents who 
utilized all of their original envelopes was calculated for each 
success group(Table 8). Sixteen per cent of the respondents who 
received 8 or fewer envelopes returned them all, but only about 
5 per cent of the respondents who received 9-25 envelopes returned 
them all. Only 10.6 per cent of all respondents used all their 
original envelopes. This percentage is small enough that lack of 
envelopes could not have introduced a serious bias in the data. In 
future surveys, however, the numbers of envelopes will be increased. 
Supplemental Shipments of Envelopes 
The explanatory letter (Figure 2) asked the hunter to send the 
Bureau a post card if he needed more envelopes. Sixty-seven requests 
for additional envelopes were received. Forty-three of these were 
from hunters whose names were part of the original sample, and 24 
were from volunteers who had not been sent an original shipment. 
Hunters who asked for envelopes without specifying the number were 
sent 10, and hunters who asked for a specific number of envelopes 
were sent the number they requested. In addition to the post-card 
requests for envelopes, a number of hunters wrote requests on the 
envelopes in which they sent wingse These requests were not found 
until the time the wings were examined after the close of the 
hunting seasone In the 1960 wing survey, an addressed air-mail 
post card will be inaluded with the wing envelopes to make it easier 
for the hunter to write for more envelopes. 
Use of the extra envelopes that were requested is shown in 
Table 9 for those hunters who could be identified from individual 
numbers. Many of the extra envelopes were used, although some 
hunters apparently overestimated their needs. 
CHRONOLOGICAL DISTRIBUTION OF THE KILL 
Distribution Through The Season 
The seasonal distribution of wings received was compared with 
the seasonal distribution of the kill reported on the Mail Question- 
naire Survey (Table 10). Both surveys indicated that the kill was 
more heavily concentrated early in the season and tmt the differences 
were greater in some States than in others. The Mail Questionnaire 
Survey indicated much less difference among States in the seasonal 
distribution of the kill than did the wing collection. The Mail 
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