presented in preliminary form in a series of short courses in specimen 

 preservation, held during the first 7 months of 1945 through arrange 

 ments made by the U. S. Department of Agriculture Extension Service 

 at the State Agricultural Colleges of Florida, New Mexico, Oregon 

 Washington, Idaho, Montana, North Dakota (in conjunction with 

 South Dakota), Illinois, and Massachusetts (in conjunction with 

 Vermont, New Hampshire, Rhode Island, and Maine). Members of 

 the college faculties and of the Experiment Station and Extensio: 

 Service staffs of these States cooperated in amplifying and revising parts 

 of the original text. Acknowledgement is also made of the assistance 

 received from numerous other sources both within and outside of the 

 United States Department of Agriculture. 



IV 



iLmJS^ 



