Tray for biological tests
FIG. 1 is a top plan view of a tray for biological tests showing our new design; 
     FIG. 2 is a bottom plan view thereof; 
     FIG. 3 is a front elevation thereof; 
     FIG. 4 is a rear elevation thereof; 
     FIG. 5 is a side elevation thereof; 
     FIG. 6 is a cross section taken on line VI -- VI of FIG. 1; and 
     FIG. 7 is a cross section taken on line VII -- VII of FIG. 1.