THE ANTISK1TICISATION OF RUBBER. 135 



observed on cultivated Para rubber, is largely due to the action 

 of bacteria on the proteids and, perhaps, some of the gummy 

 and sugary matters present in the rubber. A similar condition 

 is, however, frequently observed in rubber which contains a 

 large percentage of resinous and oily substances, which have a 

 low melting point. 



The tackiness due to micro-organisms is readily infectious, 

 and care is therefore necessary to separate sound rubber from 

 affected rubber. 



Tackiness may be often observed on the latex left adhering 

 to collecting vessels, tapping knives, &c., so that it is necessary 

 to keep all articles employed in the tapping, collection, and 

 preparation of rubber scrupulously clean, with a view to avoid 

 infection. 



Thorough drying and antisepticising the rubber are, however, 

 the most effectual means of combating this evil. 



