58 TWELFTH REPORT. 



A Biological Survey of Dickiuson County, Miehigau. A report ui)oii 

 the investigations of a field party in the summer of 1909. 



The Reptiles of Michigan. By A. G. Ruthven and Frances Dunbar. 



The Butterflies of Michigan. By W. W. XeAvcomb. 



The Mammals of Michigan. By X. A. Wood. 



The Agarics of Michigan. By C. H. Kauffman. 



Besides the work represented by the al)0ve reports the survey ma- 

 terial has been borrowed by various specialists and used in Avork the 

 results of which have been published elsewhere. 



During the summer of 1910, the appropriations of the survey will be 

 used in a botanical survey of a portion of the peach belt of Michigan, 

 under the direction of C. H. Kauffman. In addition to this work a party 

 of zoologists will be placed on the Charity Islands, Saginaw Bay, the 

 necessary funds having been provided by Hon. W. B. Mershon of Sagi- 

 naw. 



I believe we are justified in saying that the results obtained so far 

 decidedly exceed in value the amount expended in obtaining them, but 

 I cannot close without giving the credit to whom it belongs. Much 

 of the work has been done either by volunteers or by men who have 

 done the work for their field ex})enses. In some cases we have paid 

 small salaries, but in very few instances has the amount been more than 

 a verv nominal one. In addition to this manv of von have given freelv 

 of your time and money to make the survey a success. To me one of 

 the most pleasant features of the work, and one Avhich I believe will 

 do much to insure for the survey a pros]>erous future, is the way in 

 which you have come to its assistance in those discouraging times, only 

 too frequent, when we have unsuccessfully tried to make the available 

 facilities cover the plans for work that we judged should be carried out. 



