- teenth band by the very ee method I shall append, or to 
make a photograph of them, either of which t. think, 
_ speedily bring them to my opinion. 
I have lately made a careful study of a nineteen-band plate 
; to Rev, Dr. F. A. P. Barnard, which was made for 
him by obert during 1867. 
___ , To convince all microscopists interested of the accuracy of 
a my statements, I have had p pe of the mt bands 
by Dr. E. Curtis, at the Army Medical Muse 
Tam satisfied that I have seen, and that Dr. “Ourtis has 
: fee De the true lines in the fifteenth band, but no 
| “rma Dr. Curtis has also photographed two views of the 
te nineteenth bands, in 
number and character to be spurious, althoug h he 
_ and I supposed them to be real his rte them by the 
method I shall presently mention. For exampl lg Pe ter 
_ lines in the photograph of the bebctemch in num- 
Fist, i lines, Eighth, 26 lines. Fifteenth, 45 
Second, 10 « Ninth,” 27 Sixteenth, der rcounted. 
Thin, 13 « Tenth, 36.4% Seventeenth,“ 
Fourth, 15 « Eleventh, 34 “ Eighteenth “ 
Rifth, 17 « Twelfth, 37 “ Nineteenth,“ “ 
ae. % Thirteenth, 40 “ 
Seventh, 23. « Fourteenth, 43 * 
_ | The er gs were taken with the ;,th of Powell and 
_ ha a akete sufficient to magnify 1000 diameters 
< a The slide was illuminated by direct sunlight passed 
through a solution of sulphate of copper in ammonia, and 
_ “oneentrated by an achromatic condenser, with large dia- 
‘agm opening, without any central stop, the pencil made 
. oblique by throwing the condenser to the right or left of its 
te cen centering. I tried on the slide many object glasses, in- 
cluding an ith of Ross, a j,th of Tolles, a No, 11 immersion 
' the best results with the jth. The ;',th of Powell and 
Account of the cere est of cover. 
Dr. ©: has also 
ot Jour, atone Series, VOL. yee oa 138—Nor., naar 
24 
J.J. Woodward on Nobert’s Test-plate. 353. 
hear 
id did not do quite so well as the ath, ae age on 2 
