656 METHODS AND FORMULAS V 12.2-V 13.1 



12.2 Harting test. 1880 Beale gutta percha cement Beale 1880, 56 



formula: turpentine 90, gutta percha 6, shellac 6 



preparation: Dissolve turpentine in gutta percha with stirring at 50°C. Strain. Dis- 

 solve shellac in strained fluid at 60°C. Continue heating until a test drop placed on a 

 cool surface becomes reasonably hard. 



note: This is to be used as a thermoplastic cement, particularly for attaching hard 

 rubber cells. 



12.2 Hood and Neill 1948 20540b, 23 :217 



formula: asphalt -±2, Canada balsam 15, paraffin (48°C.) 28, pitch 15 



12.2 Kroenig 1886 1780, 27:657 



formula: beeswax 20, rosin 80 



12.2 Lataste test. 1942 Langeron Langeron 1942, 677 



formula: paraffin 60, rubber scrap 30 



preparation: Heat paraffin and rubber scrap till solution takes place, taking equal pre- 

 cautions against fire and suffocation of the technician. 



12.2 Martin 1872 Martin 1872, 169 



formula: rosin 80, beeswax 20, tallow 10, oil color as desired 



12.2 Mendeleef test. 1942 Langeron Langeron 1942, 677 



formula: beeswax 12.5, rosin 50, ochre 20, linseed oil 0.5 

 preparation: Melt wax. Add rosin when hot. Stir to perfect mixture. Grind ochre and 



oil to a paste. Add to hot mixture. 

 note: Any other appropriate pigment may be used in place of the ochre. 



12.2 Muir and Judah 1915 4349, 5:71 



formula: Trinidad asphalt 85, boiled linseed oil 12, oil of amber 3 

 preparation: Raise the oils to Iwiling and add 25 asphalt, boil 30 minutes and cool. Re- 

 melt and add remaining asphalt in 4 portions, cooling and remelting between each 

 addition. Boil 45 minutes after last addition. 



12.2 Noyer 1918 6630, 81:741 



formula: rosin 80, lanolin 20 

 preparation: Melt together. 



12.2 Oschatz 1842 test. 1847 Cooper Cooper 1847, 207 



formula: sealing wax 50, white lead ground in oil 50 

 preparation: Melt ingredients together. 



13 OTHER CEMENTS, LUTES, AND VARNISHES 



13.1 Formulas 



13.1 Langeron 1942 Langeron 1942, 327 



formula: white beeswax 65, Venice turpentine 35 

 recommended for: rolling into pellets to support coverslip. 



13.1 Martin 1872 dead black varnish Martin 1872, 172 



preparation: Mix lamp black and gold size in a mortar to a thick cream. 



V 20 Adhesives 



The adhesives given in the present section may be distinguished from the cements, 

 lutes, and \arnishes of the last section by the use to which they are put. A cement or 

 varnish is required to have properties other than that of causing one object to adhere to 

 another. The adhesives most commonly employed in microtomy are those used to attach 

 sections in paraffin ribbons to a slide. It is not absolutel\- necessary to use an adhesive 

 for this purpose, because a section of animal material, flattened with distilled water on a 

 chemically clean slide, will remain attached through most subsequent manipulations. 

 When an adhesive for paraffin ribbons is used, it may be applied in either of two ways 



