400 BOTANICAL GAZETTE [MAY 
students have need of a section cutter. This razor has two advantages 
over most safety razors, so far as our present purposes are concerned. 
In the first place, it is much like an old-style razor in general shape, the 
blade, however, being 
removable and pro- 
tected by a nickel- 
plated brass guard. In 
the second place, the 
blades are thicker, 
longer, and stiffer than 
those provided with 
most safety razors. 
Mw AT 
ham- Demonstrator.” 
As shown by 4, the pro- 
tecting shield has been 
cut away so as to leave 
a portion of the blade 
exposed for use. The 
other drawing (b), show- 
Fic. 1—Modified safety razor: explained in text ing the other side of 
the razor, illustrates the 
cutting off of the brass supporting handle, thus leaving the blade free 
beneath. A screw fitted into the handle at the base of the blade is 
at once the means of holding the latter rigid, as well as of permitting 
its easy removal for cleaning or changing the cutting edge, the slot 
filed into the base of the guard making of this a very simple operation. 
In practice this razor has proved very successful with large classes, 
providing an abundance of sharp edges as well as saving the time of an 
assistant on whom the work of honing would otherwise fall.—J. P. 
GIVLER, Southwestern College, Winfield, Kansas. 
ON STEMONITIS NIGRESCENS AND RELATED FORMS 
That MacsripE, in his North American slime-moulds, retains 
Stemonitis nigrescens Rex as a distinct and well marked species, while the 
- Listers, in their Monograph of the Mycetozoa, réfer it unhesitatingly 
