This instrument allows examination of both transparent and opaque, massive specimens by providing a light source above the object of study. Magnification does not usually exceed 30 x but depth of field and field of view are excellent. Also, dissecting scopes often function in a zoom fashion, allowing smooth transition from low to higher magnification. Additionally, dissecting scopes permit the study of relatively large, living organisms that would be altered by wet mount preparation Examine the following objects with the dissecting scope. Course grained granitic rock .
Granite is an example of an igneous rock .
As you will learn in later labs, rocks are joined aggregates of one or more mineral types. Examine the specimens of granite and note these different mineral types. Fossil leaf impressions . Fern sori Living Hydra The Internet . Therefore, throughout this course we will be making frequent and important use of the Internet to complement laboratory and lecture study.