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An opera glass is a great deal better than no glass at all; a field glass is better still, and a Bausch & Lomb binocular of six to eight magnifying power is the best of all; being almost equal to having the bird in hand. The observer must lose as little time as possible in sighting a shy bird, or it may escape him altogether.
Bausch mentions a case in which the omentum, stomach, and pancreas were found in the thoracic cavity, having protruded through an extensive opening in the diaphragm. Muys, Bonnet, Blancard, Schenck, Sennert, Fantoni, and Godefroy record instances in which, after rupture of the diaphragm, the viscera have been found in the thorax; there are many modern cases on record.
"The American manufacturers, Bausch & Lomb Optical Company, Rochester, N.Y., and No. 130 Fulton St., New York city, have this year produced a microscope of the Continental type which is especially designed to meet the requirements of the secondary schools for an instrument with rack and pinion coarse adjustment and serviceable fine adjustment, at a low price. The Use of the Skeleton and Manikin.
For identifying the tree-top flitters an opera glass is scarcely powerful enough. A field glass or a Bausch & Lomb binocular is really a necessity. It draws the bird right down to you, while at the same time the elusive creature remains at what it regards a safe distance. Its conduct will therefore not be constrained, and the observer can study it in its natural poses.
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