E. J. VANDERWALL, DIRECTOR 
FORESTS S, PARKS--C. L. HARRINGTON 
COOPERATIVE FORESTRY--F. G. WILSON 
FOREST PROTECTION--NEI L H. LE MAY 
INFORMATION & EDUCATION-- 
   J. H. H. ALEXANDER 
                     COOSERVATion 
 
 
ERNEST SWIFT--ASSISTANT DIRECTOR 
 
 
         GAME MANAGEMENT--W. I 
         LAW ENFORCEMENT--A. J. 
         FINANCE--C. A. NONTLY 
         CLERICAL--MISS LYDIA 81 
[TMflT 
 
 
            MADISON 2 
HORI00N MARSH WILDLIFE AREA       FILE REFERENCES 
 
 
                        Horicon, Wisconsin 
 
                                                      January 13, 1947 
 
 
 
 Professor Aldo Leooold           h$ Cj 
 University Farm 
 University of Wisconsin 
 Madison, Wisconsin 
 
 Dear Professor Leopold: 
 
       We have received a memorandum from William F. Grimmer request- 
  ing that you be suoplied with data regarding locJl oroduction of all 
  ducks on Horicon Marsh during the oast season. 
 
       The situation briefly is that the f'igures comoiled by Ralph 
 Hookins on brood counts and estimates of all ducks on the State area 
 during July and August are oresented in the Pittman-Robertson 
qQuarterly Reoort now in the Madison office. The data would best be 
  ts-ken from this reoort as we do not yet have it in this office in 
  final form. You could easily get a copy of the report by calling 
  either Mr. Grimmer or Irven Buss. 
 
       During the late summer Mr. Hookins estimated that there were 
  between 3000 and 3500 ducks of all soecles on the area. However, 
  the actual number of young oroduced in the area is a rather elusive 
  figure to determine. We do not htve sex or age ratio figures to 
  a-oly to the above total estimate nor do we have any measurement of 
  ingress or egress. 
 
       I would exoect that ducks coming into the area after the breed- 
  ing season would be comoosed mainly of wood ducks and baldoates. 
  Egress is orobably not as an imoortant figure since our loss of 
  nesting redheads. 
 
       If you need any more information in this regard, please let 
  me know. 
 
 
Very 
 
 
,JRS:RD