New Goniometer Eye-piece for the Microscope. 409 
Ist. A scale of 100 heavy India ink lines about 3 of an inch 
apart are drawn on a dead white surface of Bristol board. The 
es king every ten divisions are inches long and 
_ extend one inch each side of the scale; those marking Ala 
five divisions are five inches long and extend one half inc 
length of one-half inch. In this the lines are zi, of an inch 
apart. After intensifying, washing and drying, a cover of thi 
g is cemented on with Canada balsam, and the slide cut to 
the slit in the micrometer eye-piece. It can b also mounted 
with a spring and micrometer screw, like J ackson’s micrometer. 
India ink, divided into degrees. The center is indicated by a 
dot, and one diameter is drawn. Every five and ten degrees 
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