=<, o4 J. J. Woodward on Nobert’s Test-plate, 
imperfect, spurious lines are shown. The thirteenth band, 
example, shows 25 lines in one photograph, and 16 in | 
other, the real number being 40. “ 
These two photographs agree closely in character with 
of the sixteenth, seventeenth, eighteenth and nineteenth 
The foregoing results lead me to believe that the lines in 
last four bands are really ruled as claimed by Nobert; and 
that with greater defining power the true lines could be sem 
They also compel me to doubt the accuracy of the statements 
of those who think they have seen the true lines in any 
beyond the fifteenth, and especially if the lines seen have 
been counted. a 
I may here mention that the first of this series of 
graphs represented the last four bands, and was 
Curtis some months ago. Both he and I supposed at the: 
mistake copied the twelfth, thirteenth, fourteenth < 
bands : 
disappears. Still better than this is the followimg 
_ The microscope being set up in a dark room as though 
with as much ease and precision as if they ¥ 
to be touched by the finger. 
