. The diagnosis of diseases of women . laced in equal partsof sulphuric ether and absolute alcohol for from six to twenty-fourhours, depending upon the size of the section. Next the section ischanged to a dilute solution of celloidin in ether for from six totwenty-four hours; it is then placed in a thick solution of celloidinin ether for an equal time, when it is ready to mount upon a corkfor sectioning. After blocking the specimen on wood or cork it is allowed tofix firmly in the open air or under a bell-jar, and is then placed in70 per cent, alcohol for an hour or more. The section is now re
. The diagnosis of diseases of women . laced in equal partsof sulphuric ether and absolute alcohol for from six to twenty-fourhours, depending upon the size of the section. Next the section ischanged to a dilute solution of celloidin in ether for from six totwenty-four hours; it is then placed in a thick solution of celloidinin ether for an equal time, when it is ready to mount upon a corkfor sectioning. After blocking the specimen on wood or cork it is allowed tofix firmly in the open air or under a bell-jar, and is then placed in70 per cent, alcohol for an hour or more. The section is now readyfor cutting and mounting, 7 98 GENERAL DIAGNOSIS The embedding of specimens in paraffin is an excellent methodfor general laboratory purposes, but is somewhat complicated forprivate laboratory use. When the tissues are soft and small, as inscrapings, ideal sections are prepared by this method. For serialsections no other method can be employed. After thoroughlydehydrating the tissue the specimen is immersed in a solution of Fig. 22. The student microtome. This is intended for individual and laboratory use where areliable mechanical microtome at small cost is required. It is extremely simple, yet veryaccurate in construction. This is one of the few models which have Iemained practicallyunchanged, showing that it is adapted for its work. The stand is one solid piece of knife block is as heavy as is consistent with the size of the instrument. The feedarrangement is carried in a metal stirrup attached permanently to the front of thestand, and consists of an accurately cut micrometer screw having a pitch of mm., witha graduated head divided to 100 parts, each graduation, therefore, having a value of 5microns. The object clamp is adjustable in two planes, and can be set for paraffin orcelloidin cutting. zylol and paraffin, or in chloroform and paraffin, for from two totwenty-four hours, and is kept at a uniform temperature of 37° the specimen is immersed in m
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