242 TAGG—NOTES ON MUSEUM-METHODS 
copper wire painted with vermilion paint are employed. The 
labels and the pointers are attached with a gum made of equal 
parts of gum-tragacanth and gum-arabic or with the gelatine 
solution given on page 238. 
III. LABELLING MODELS. 
The names of the parts of models are attached to pointers made 
of copper wire. Such pointers, in turn, are fastened to the parts 
to be named. The cement used for both ‘operations has the fol- 
lowing composition :— 
Wax cement for attaching names to models. 
Beeswax, # parts. 
Resin, I part. 
The ingredients are melted together and the cement used warm. 
At other times the wire used is pointed and the pointed end 
driven into the part of the model named. To a small piece of 
cork or pasteboard fastened at the free end of the wire the 
name-label is attached with gum or paste. 
LUTINGS FOR LIDS OF VESSELS. 
I. PERMANENT SEALING. 
For permanently sealing the lids to museum jars I have 
found bichromated gelatine prepared as follows efficacious : — 
1 oz. Nelson’s Amber Gelatine is soaked in water for several 
hours ; the water not absorbed by the gelatine is then poured off 
and the gelatine melted over hot water. When melted, § grains. 
of bichromate of potash are added and the whole stirred. 
The melted gelatine is applied with a pipette or glass rod to 
the rim of the vessel, and the lid, after it has been gently warmed 
over a Bunsen flame, is laid in position over the mouth of the jar. © 
The gelatine should be fairly stiff; if too weak when the warm 
lid is laid on it may run down the inside of the vessel. When 
the lid has been placed in position, the cement is allowed to cool, 
and under the action of light it forms a luting insoluble in alcohol 
or water. 
