272 
INDEX. 
V. 
Vertebrates developed without any 
previous Fecundation, 249. 
the Ascidian Origin of, 249. 
Vertical Illuminator of Beck, and 
Wenham’s Reflex Illuminator, 157. 
W. 
Water, 'on the Microscopic Examination 
of. By Wentworth L. Scott, 237. 
Wenham, F. H., on the Measurement 
of the Angle of Aperture of Micro- 
scope Obi ect-glasses, 187, 212. 
Wood, on the Porosity of, 44. 
Woodward, Surgeon J. J., U.S. Army, 
a Simple Device for the Illumina- 
tion of Balsam-mounted Objects for 
Examination with certain Immersion 
Objectives whose “Balsam Angle” 
is 90° or upwards, 61. 
END OF VOLUME XVIII. 
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