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SUMMARY OF CURRENT RESEARCHES RELATING TO 



to mount specimens by this method, the author had devised certain 

 appliances which were described (fig. 33). 



Levelling Taile. — A large glass table (with levelling screws) with tall 

 legs, to allow the inspection of the specimen from below whilst it is being 

 mounted. 



Beary Steel Bars of suitable shape and thickness, to form the sides 

 of a mould for the gelatin medium. The inner side and one end of each 

 of these bars are polished, and cut at such an angle that they come in 

 perfect apposition with the ends of other bars ; the gelatin sets rapidly 

 on coming in contact with the cold metal. 



S^ 



Fig. 33. — I. Glass table seen in section. II. Levelling screws 

 (third not seen). (There are three more supporting screws.) 

 III. Iron framework of levelling table. IV. Sections of pre- 

 paration mounted in aluminium dish with flange (arsenious 

 jelly between two glass plates indicated by faint horizontal 

 shading). V. Section of preparation mounted in aluminium 

 box. VI. Section of specimen in process of mounting. The 

 specimen is laid on the glass plate, through which it is to be 

 seen, and it is covered with arsenious jelly. VII. Heavy steel 

 bai-s used to hold the jelly while it is setting. VIII. Counter- 

 balanced levers used to press the specimen against the glass 

 plate by means of rods sliding on the levers. 



Moulds for making plaster of Paris boxes, which need not be de- 

 scribed. 



Aluminium Dishes and Boxes. — In order to save the time required 

 for the preparation of plaster of Paris dishes, the author had various 

 kinds of earthenware and glass dishes made, but these were heavy, 

 clumsy, and expensive. Finally, a form of aluminium dish was adopted, 

 which has answered the purpose very well. The first type has a flat 

 flange, to which the top glass plate is fixed by suitable , binding. To 

 simplify still further the work of mounting, boxes were made to the 

 lid of which the front glass is fixed ; the box is closed like an ordinary 



