THe MICROSCOPE. 95 
VIEWS ABOUT THE CITY OF HARTFORD. 
A number of beautiful photographs, the gift of our fellow- 
worker Dr. W. J. Lewis, consulting surgeon for the Travelers’ 
Insurance Co. 
KOocH’S METHOD OF STUDYING THE BACTERIA. By T. Mitchell 
Prudden, M. D., Lecturer on Histology in Yale Medical College. 
This is a report to the State Board of Health of Connecticut, 
and contains a very able account of Koch’s methods of work. 
THE CENTURY. 
The April number is full of the most interesting matter. 
Three articles describe the cruise of the Alabama. These arti- 
cles alone are of sufficient interest to make this number exceed- 
ingly instructive and entertaining. 
— o > 
Eye or tHe Horse-rry.—Mr. J. D. Hyatt, in his studies of 
compound eyes and multiple images, remarks as a curious pecu- 
liarity of the eyes of the horse-fly that the lenses of the upper 
and anterior part are much larger than those situated below a 
median line, the larger facets having at least twice the diameter 
or four times the superficial area of the smaller. The larger 
lenses form pictures at a plane considerably above the focal 
plane of the smaller ones. Thus these insects are furnished 
with eyes of two varieties, corresponding to our long-sight and 
short-sight spectacles; in other words with telescopic and 
microscopical eyes, the telescopic looking upward and forward, 
and the microscopical downward.— Popular Science Monthly. 
RoceEtxin colors bone, muscle, connective tissue, glands, 
and epithelium cherry-red ; gold or orange serves for fresh or 
alcoholic or chromic acid preparations. Bone is stained deep 
orange red, cartilage, gold, connective tissue, reddish; especially 
valuable for glandular tissue; it gives a splendid appearance to 
liver injected with Berlin blue, the blue vessels showing on a 
gold ground; sections of skin give fine results. Preparations 
after washing and cleaning are best mounted in Canada balsam ; 
oil of cloves is mostly used for clearing, but where the colors 
are very delicate, use oil of Lavender or quite colorless oil of 
Aniseed, as the yellow color of the oil of cloves injures them. 
