A PRACTICAL DISSECTING TRAY* 



Various kinds of dissecting trays have been described by 

 Hatschek and Cori, Kukenthal, Dodge, Pratt, Mark, 

 Kellogg and others, all of which, however, are more or less 

 unsuited to general conditions of laboratory work. 



A tray which apparently meets all requirements can be 

 made by selecting a suitable china dish, attaching the 

 cloth called "cotton wool" or "cotton flannel" to the bot- 

 tom, with the smooth side down, by means of LePage's 

 glue, and pouring in a mixture of melted beeswax and 

 lampblack. The glue should previously be allowed to 

 dry at least twelve hours. Furthermore, the dish should 

 be heated slightly above the melting point of the beeswax 

 before the wax is poured in, and then allowing the bottom 

 layers of the wax to harden first. This prevents the 

 separation of the wax from the side of the dish as well as 

 the formation of cracks on the surface. Trays such as 

 described have been in use in the laboratory at Kenyon 

 College for more than a year, and have been found 

 practical in every respect. 



♦Reprinted from The Ohio Nafuralisi, vol. 4 (1904), pp. 66-67. 



