V 12.1-V 12.2 VARIOUS FORMULAS G55 



12.1 Riiyter 1934 4285a, 11 :410 



preparation: Saturate 100 water with oil of thyme. Soak 20 gelatin overnight. Melt. 



Add thyme water to make 100. Add 10 5% potassium dichromate. Keep in dark. 

 note: This formula is identical with Riiyter 1935 (23632, 51 :374). 



12.1 Seller 1881 Seller 1881, 93 

 formula: acetic acid 100, gelatin 27, gum ammoniac 2.2 



preparation: Dissolve the gum in the acid. Filter. Warm and dissolve gelatin. 

 note: Seiler {loc. cit.) recommends that the cooled ring should be painted with 2% potas- 

 sium dichromate and exposed to light. 



12.2 Nonaqueous Base 



12.2 Apathy 1889 23632, 6 :164 

 formula: paraffin 60°C. 50, Canada balsam 50 

 preparation: Heat ingredients till golden brown. 



note: The identical composition can be achieved by dissolving 45 parts Canada resin in 

 55 parts molten wax. 



12.2 Beale 1880a marine glue Beale 1880, 55 



formula: ligroin 100, Para rubber 50, shellac 50 

 preparation: Dissolve Para rubber in half ligroin with gentle heat. Dissolve shellac in 



half ligroin with gentle heat. Cool. Mix thoroughly. 

 note: The mixture may either be evaporated until solvent free, in which case it is used 



as a thermoplastic cement, or diluted with more ligroin for use as a varnish. 



12.2 Beale 1880b French cement Beale 1880, 59 



formula: rubber 100, lime q.s. 

 preparation: Melt the rubber over an oil bath. Add the lime, little by little, until the 



mixture thickens. Scrape into a mortar and heat with a pestle until cool enough to 



knead with the hands. 

 note: The cement, when cool, should be of the consistency of stiff modelling clay. It is 



remarkably waterproof and adheres perfectly to glass. 



12.2 Belling 1926 2975, 50:160 



formula: paraffin 50, gum mastic 50 



12.2 Cigalas test. 1942 Langeron Langeron 1942, 677 



formula: beeswax 70, rosin 30, lard 10 

 preparation: Dissolve ingredients together. 



note: This is an excellent waterproof cement for temporary aquaria or for mending 

 leaks. 



12.2 Coburn 1915 4349,5:71 



formula: white lead ground in oil 50, raw linseed oil 7, rosin 29, 95% ale. 7, shellac 7 

 preparation: Mix the oil with the white lead and raise to the melting point of the rosin 



which is then incorporated. While cool but still liquid, stir in the shellac dissolved in 



the ale. 



12.2 Fant 1932 in verb. 



formula: anhydrous lanolin 30, rosin 55, "dried" Canada balsam 10 



preparation: Melt ingredients together. 



note: This formula was verbally communicated to the author by Fant in 1932 and by 

 the author communicated to others. This lead to an unsigned note in Watson's 

 Microscope Record 1934, attributing the composition to Gray; the error has been 

 perpetuated by Gatenby and Cowdry 1937, 230, and others. 



12.2 Gage 1896 Gage 1896, 179 



formula: V 11.2 Hitchcock 1884 100, castor oil 10, Venice turpentine 10 



12.2 Gray 1934 see V 12.2 Fant 1932 (note) 



12.2 Griffiths test circ. 1865 Davies Davies, 22 



formula: rosin 50, beeswax 10, red ochre 10, Canada balsam 20 



