16 



For the preparation of imitations of striped patterns, pig- 

 mentation of butterfly and bird wings, banded structure of ice, 

 agate, onyx, quartz, etc., zonation in the molluscan shell, fish 

 scales, mammalian bone, zebra and other hair patterns and 

 banded leaves, concentric zonation in bacterial and fungous 

 cultures, the chemically produced Liesegang rings may be used. 

 Small glass plates similar to those described above are covered 

 with a thin coating of ten percent gelatin solution containing one 

 percent or less of Potassium bichromate or Sodium arsenite and 

 then a drop of concentrated silver nitrate solution or a small 

 crystal is placed where the center of the concentric rings is 

 desired. With a little ingenuity the position of the silver may 

 be varied by making lines and other combinations so that the 

 various patterns enumerated above may be made. 



Exhibition case constructed of lantern slide covers. Appearances such as 

 are show n in figure 4 may be represented in such a glass box. 



Very beautiful and fantastic tri-dimensional structures of 

 calcium phosphate and carbonate imitative of ornamental di- 

 minutive gardens, suggestive of sea bottoms containing, shells, 

 algae, and corals; the well known coral fungus, roots, rhizoids, 

 stems and branches, carpophores, etc. will form in the solution 

 described below. Tests tubes, beakers, vials, aquarium jars or 

 any glass receptacles are satisfactory. I have found that a very 

 entertaining little narrow glass box can be made of two lantern 

 slide cover glasses between which strips of plate glass are cemen- 

 ted around the margins with a water proof glass, cement or 



