393 
the tree reaches its full size in from 5 to 7 years. These consider- 
ations appear to incline Dr. Rusby to the opinion that if all other 
sources of rubber were to fail, this one could probably supply the 
world’s entire requirements. 
The properties of the “palo amarillo” rubber are peculiar. 
Taken by itself it is of only medium quality, but mixed in suitable 
proportion with other varieties, especially with para rubber it 
markedly improves them. 
J. MAH, 
Callitris sinensis—In Tschirch (Die Harz und die Harzbehiilter, 
vol. i., p. 536) there is a paragraph on the resin of Callitris sinensis, 
has the following paragraph in his La Matiére Médicale chez les 
Chinois (1874, p- 134): : ; 
“ Callitris sinensis, jou-yang-zu sian, Tatarinow, 498 ; yun hiang, 
are transliterated by Bretschneider in his Botanicon Sinicon, vol my 
p. 608, as ‘ju hiang.’ Of this Bretschneider says on p. b t. 
ratar. (Cat. 65) identifies ju hiang with Resina Sandarac, but, 
the drug ju hiang which I procured from a Chinese drug nop an 
which has been examined by Profe 
. 
fact, as Bretschneider (l.c.) points out, Cley ed ge 
Ju hiang with “ Thus ” Gnosis stating in hie § nde tcind hoes 
sinicae, (1682), Medic. Simpl. No, 210: . Jit a acninitur 
acro-dulce, ulceribus medetur, creat carnem, sistit dolores, 
i oleum”; and similarly Williams, in his C/ 
Ju hiang with Sandarach, evidently e 
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