332 PREPARATION OF MODELS [CH.X 



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exact modeling is undertaken. The paper sections slide very easily 

 upon one another. The most satisfactory means of fastening them 

 together is by the use of ribbon pins, ordinary pins, or wire nails of 

 various sizes, depending on the size of the model. No kind of paste 

 or glue was found suitable for this purpose." 



499. Finishing the Model. "When the model is well 

 formed, inequalities are best removed by rubbing with the edge of 

 a dull knife and smoothing with sand paper. Any dissections of 

 the model for showing internal structures should be planned for at 

 this stage for it is now more easily separated than later. It is also 

 at this time that superfluous "bridges," which have been left in 

 place to support detached parts, would better be removed." 



"To finish the model it is held together firmly and coated with 

 hot paraffin either by a camels hair brush or by dipping in paraffin 

 and removing the superfluous coating by a hot instrument. One 

 might use a thermo-cautery for this purpose." 



"The paraffin renders the model almost of the toughness ot 

 wood without destroying the lightness of the paper." 



500. Coloring the Surface; Dissectng the Model. 

 "For coloring the surface of the model, it was found most desirable 

 to use Japanese bibulous paper, lens paper ( 125) which had been 

 dipped in water color and dried. Any of the laboratory dyes or inks 

 can be used, such as eosin, picric acid, methylene green, black ink, 

 etc. The colored lens paper molds over the surface with ease and 

 is held in place by painting with hot paraffin. All color and enum- 

 eration lines and fine modeling show through the transparent paper." 

 "When the model ceases to be a working model it can be cov- 

 ered with oil paints mixed with hot paraffin and rubbed to any 

 degree of finish desired." 



"One can dissect a model by a hot knife run along the planes 

 of cleavage or cut across them by a saw. ' ' 



For the literature of blotting paper models see : Susanna Phelps Gage, 

 Amer. Jour. Anat., vol. v, 1906, p. xxm ; Proceedings of the International 

 Zoological Congress for 1907; Anatomical Record, Nov. 1907. (From this 

 paper the above quotations were made). Zeit. wiss. Mikroskopie. Bd. xxv., 

 1908, pp, 73-75. 



" Blotting paper models have also been made and demonstrated by Dr. J. H. 

 Hathaway and by Dr. J. B. Johnston at the Association of American Ana- 

 tomists held in New York, 1906 (Proc. Assoc. Amer. Anatomists, Anat. Record 

 April i, 1907). 



