Lectures on nervous diseases from the standpoint of cerebral and spinal localization, and the later methods employed in the diagnosis and treatment of these affections . , if he can describe the sensationcorrectly. (2) The ability to locate contact impressions. With tests of de-creasing delicacy (the touch of a hair being the most delicate, and painfulimpressions the least so), notice to what extent the patient is able to 200 LECTURES ON NERVOUS DISEASES. correctly designate the point of contact of the body employed with theskin of different h:)Ciiiities. (3) The degree of sensibility of dif/e
Lectures on nervous diseases from the standpoint of cerebral and spinal localization, and the later methods employed in the diagnosis and treatment of these affections . , if he can describe the sensationcorrectly. (2) The ability to locate contact impressions. With tests of de-creasing delicacy (the touch of a hair being the most delicate, and painfulimpressions the least so), notice to what extent the patient is able to 200 LECTURES ON NERVOUS DISEASES. correctly designate the point of contact of the body employed with theskin of different h:)Ciiiities. (3) The degree of sensibility of dif/erent regions. This has to beinvestigated with great care in some cases. Several methods are em-ployed to determine it with accuracy. Those are as follows:— (a) Objects of diferent shapes may be laid upon the skin and thepatient requested to describe their form and character. Coiiis, keys, andw^eights may be emi)loyed for this purpose, as they are always to be test should be used over many parts of the body, and the resultsobtained compared with those of similar experiments made by the phy-sician upon himself or some healthy person. pi b^|. Fig. 64.—Hammonds yEsTHESiOMETER.—When closed it can be conveniently carried in the pocket. (b) The appreciation of pressure, as suggested by Weber, may betested by placing weights of varying sizes upon the skin of some part,that has previously been supported in order to avoid the so-called mus-cular sense being a factor in the patients decision. Dr. Beard has de-vised an instrument for this test that answers all purposes very well. (c) Again, the various forms of festhesiometers are used to detectthe minimum distance which can exist between two points of simplecontact with the skin without destroying the distinct percejjtion of bothpoints by the patient. This distance varies in health between extremelywide limits, because some regions are abundantly supplied with sensory TESTS FOR TACTILE SENSIBILITY. 201 nerves an
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