260 General Notes. [ April, 
by their discharge the impact of the first light wave. Having 
thus the power of keeping retine just as they leave the eye, by 
immersing them in darkness, or yellow light, very much as the 
photographer takes his negative from the camera and preserves 
and finally fres the image, working at it always by yellow gas- 
ight, Kühne also preserved the images that were in the natural 
photographic plate, the retina of the natural camera, the eye, and 
actually fired these images by soaking them in a solution of alum. 
Thus he would fix the head and one of the eye-balls of a living 
rabbit opposite a bright skylight, cover it with a black cloth for 
five minutes, then remove the cloth, exposing the eye a few min- 
utes, immediately remove the eye, soak in alum, and, upon exam- 
ining the retina, find a beautifully accurate image of the skylight, 
showing its separate parts, the boards, etc. Even the eye ina 
severed head gave these results. The images were generally of 
a rosy hue. 
Now, while this proves that images of objects seen before 
death may be found on the retina after death, yet, since to make 
this possible, the eye and the object must be perfectly still for 
some minutes, and the light must be strong, it probably never . 
has happened, and never will happen that the image of the mur- 
derer is found in the eye of his victim, murder being a deed of 
darkness, and a deed tending to anything but immovableness in 
those enacting it. 
Annuat Erections IN Microscopicar Societies.—The follow- 
ing officers of societies have been elected since those last pub- 
lished: 
Jamestown Microscopical Club. Organized June, 1873. Meets 
first Thursday evening of each month. Dr. A. Waterhouse, 
president; Chas. E. Fuller, secretary and treasurer. 
Louisville Microscopical Society. Founded January, 1874- 
Meets first and third Thursdays of each month at Louisville 
Library. Dr. J. B. Marvin, president; Dr. J. Sloan and Prof. W. 
F. Beach, vice-presidents; D. W. Lane, secretary ; J. Williamson, 
corresponding secretary; A. L. McDonald, treasurer. : 
San Francisco Microscopical Society. Henry C. Hyde, presi- 
dent; C. Mason Kinne, vice-president; X. Y. Clark, recording 
secretary; C. W. Banks, corresponding secretary; J. A. Lang- 
stroth, treasurer. 
Buffalo Microscopical Club. Dr. L Howe, president; Jas. W. 
Ward, secretary; Henry Mills, D. S. Kellicott and Geo. E. Fell, 
advisory council. 
LABORATORY WORK AT THE SEASIDE—The third session of the 
Summer School of Biology will be opened at the Museum of the 
Peabody Academy of Science, Salem, Mass., beginning July 5th 
and continuing six weeks. Lectures will be given five days of 
each week, and the best of opportunities afforded for laboratory 
