Popular Science Lectures. 445 
locally was then entered upon, reference being made to 
the manufacture of rum from molasses ', paper from 
megass ; oxalic acid, gas and various compounds from 
sawdust ; and cocoanut oil, fibre and oil cake from 
cocoanuts. The important applications and the usefulness 
of slaughter house refuse in the shape of hides, horns, 
bones, blood and other offal, and the various forms of 
city refuse, were next discussed ; and the methods pointed 
out by which what is now considered and treated as 
rubbish might be utilised and made a source of wealth to 
the community. Brief mention was made of the un- 
developed resources of the colony such as waste lands, 
fibres of various sorts, and other natural products awaiting 
utilisation. In order to do away with the large annual 
imports of leather, the establishment of tanneries was 
advocated to work up all the hides stripped within the 
colony, where numerous and valuable tanning material 
can be had close at hand. Special reference was 
made to the small tannery which is at present the only 
one in existence in the colony, situated at Albouy's 
Town on the outskirts of the city, in which some ex- 
cellent leather is prepared, the tanning material used 
being the bark of the wild mangrove obtained from the 
Essequebo River. 
The ledure was illustrated by diagrams and experi- 
ments, and prepared specimens of the various articles 
referred to. 
Errata. 
On page 340, line 24, for King of Holland, read States General. 
On page 341, line 2, for Sovereign read Stadtholder. 
On page 365, line 26, tor Ardea cocoi?, read Ciconia maguari. 
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