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The article discusses the use of the compound microscope in criminal investigation. From time to time scientific investigators who use the microscope, as botanists, cytologists, bacteriologists, embryologists, workers in clinical laboratories, and others, have been called upon to assist the investigating officers in unraveling criminal problems, and in most instances their efforts have been of great value, not merely in finding evidence, but also in disclosing to those interested in criminology in a new line of attack on crime. Interesting cases of detection of crime by means of the microscope are reported by Gross and other eminent students of criminology. Isolated cases are reported from Austria, from Italy, from France and a few from the United States. The reasons why the compound microscope is not more generally employed in criminal investigation are as follows. First, The investigating officer does not know when the assistance of the expert microanalyst may be of value, nor does he know what material should be submitted for such examination. Second, when the material is finally submitted to the expert in the use of the microscope, it has passed through so many hands as to make the findings of little value. And third, the expert to whom the material is submitted not being a criminologist, is as a rule unable to give a rational interpretation of the findings.

The article presents information on comparison microscopes, which are used for the examination of bullets and other objects. Those who have had occasion to use a comparison microscope for the examination of bullets and other objects know how very tiring such examinations may become. Not only are they tiring but they are productive of eyestrain. Both of these difficulties disappear with the use of the comparison camera. The images are large and clear and are seen by both eyes and are viewed at a normal and comfortable distance, thus materially reducing eyestrain. A series of knurled control knobs, placed in line a few inches below the ground glass, and one at either side of the ground glass, enable the operator to move the specimens in any desired direction and rotate them. After all adjustments of the two juxtaposed images have been made, one sees on the ground glass exactly what he may expect to see in the finished photograph. A time switch enables to expose for a predetermined length of time. The article also includes details of the specific parts of the comparison microscope.

The article presents a science experiment on muscles and tendons. The materials required for the experiment include a piece of the muscle of a quadruped animal, a bottle with a wide mouth and a body part of an ox containing tendons or ligaments, The apparatus required for the experiment include a compound microscope, some glass covers, and a small galvanic battery.

The article discusses the importance of making classrooms beautiful. The author, who is also a teacher, likes to teach in attractive surroundings. In Physiology classrooms, there should be different educational charts, and compound microscopes should be placed in wall cabinets. A Biology laboratory should have a big water tank for preserving snails and water plants. Classrooms should have bright tiles, and good ventilation. This increases the interest of the students in studies.