46 



YEARBOOK, PUBLIC MUSEUM, MILWAUKEE. 



[Vol. I. 



Within twenty-four hours after arrival, Mr. Tyrrell was husy mak- 

 ing color sketches and within thirt}-six hours, he was hard at work 

 making a series of plaster casts of aquatic plants, chiefly of water lilies. 



The methods of fieldwork were, in general, as simple as could he de- 

 vised. First, sites or "stations" offering suitable environmental differ- 

 ences, both as to plant and animal life, were selected and designated by 

 letter for purposes of reference. Two of these sites are shown in figures 

 23 and 24. These were then photographed before any collecting was 



Fig. 26. — Making plaster casts of plants at collecting station A., Kcshena 

 Lake, Shawano County, Wis. 



done and copious field notes were made concerning them and concerning 

 the material collected from them. Careful color notes and pencil 

 sketches were made of plants and animals collected there. All specimens 

 collected, were, of course, properly labeled and where possible, these 

 were identified in the field. Of the more perishable objects and of ob- 

 jects which were later to he i:)roduced in numbers, such as certain types 

 of vegetation, plaster casts of typical forms were secured in abundance. 

 Figure 25 shows more in detail a section of the station shown in figure 24 

 while figure 26 shows ^Ir. Tyrrell and Mr. Majerowski making plaster 

 casts on the lake shore. An essential feature of the work consisted of 



