(37) 



830. The same collected on a wire matting to allow the water to drain off. 



831. The same formed into a web of uniform thickness and afterward passed be- 



tween cold-pressing rollers to remove more water. 



832. Wheat straw paper. The preceding after being carried around heated 



cylinders to dry it and make a finished paper. 



833. The preceding after having been smoothed by passing through cold rollers 



under heavy pressure. 



834. Corrugated straw board without backing. 



835. Bottle wrappers of various forms and sizes, made from the preceding. Used 



for wrapping bottles, crockery and other breakable articles. 



836. Corrugated straw board with a backing of plain paper to impart strength. 



837. Bottle wrappers made from the preceding. 



838. A book-cover made from the same. 



839. Corrugated straw board, backed and faced with plain paper, to increase its 



strength. 



840. Wrappers made from the preceding. 



841. Chinese rice-paper pith. — The pith of the stem of Fatsia papyri/era Benth. 



(Araliaceae — Ivy Family). Native of Southern Asia. This pith is placed 

 in a lathe and is turned off into extremely thin sheets, which are used by the 

 Chinese for making their rice paper. 



842. Papyrus. — Thin sections of the pith of the stem of Cyperus Papyrus L. 



(Cyperaceae — Sedge Family). Native of the Orient. Acquired at Syracuse, 

 Sicily, by Miss Harriet L. Britton. Used like the preceding. 



843. Moss paper. — Made by the Chinese by pressing together various species of 



moss. Presented by H. H. Rusby. 



Rubber and Its Allies 



This product consists of the coagulated milk juices of a 

 large number of plants. This juice is a mixture of various 

 plant principles, some of them nutritive, others waste 

 matter. Its composition varies widely with the different 

 plants. Its essential constituent, and the one that chiefly 

 gives it value, is caoutchouc. With this occur resins and 

 a variable amount of albuminous matter, with a variety 

 of dissolved substances, all held in water in the form of a 

 milky emulsion. 



The milk is obtained by cutting or puncturing the bark 

 and placing a suitable receptacle to catch the flow. It is 

 then coagulated by various methods, in different countries. 

 The commonest method is by dipping a wooden paddle in 

 the milk, which attaches itself to the paddle in a thin layer, 

 and then holding it in a current of smoke. This process is 

 repeated until a convenient mass, known as a bolacho. 



