40 KAURI ‘* GUM.’’ 
Africa such tins are gathered from house to house by collectors, or from 
the city refuse-heaps, and employed in the nurseries. 
Experimental Tapping of Two Drees. . 
While at Waipoua I made a small ‘‘ gum-tapping ”’ experiment on 
two trees. The form of the slits made is shown on the accompanying 
sketch. After twenty-four hours the slits showed the following results : — 
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(1.) A slit, made like Maritime-pine is tapped in Gascony, but rather 
longer and less wide, in order to prevent the access of the borers. The 
Gascony resin slit is 5in. or 6in. long to begin with, about 3in, er 
4in, broad, and goes through to the wood, It is gradually ‘‘ refreshed ”’ 
till it becomes a slit several feet in length. My slit was 1 ft. long 
and Jin. wide, exposing the wood. This slit showed only a small How 
of rWsin at the time, but after twenty-four hours there were some three 
tablespoonfuls of a creamy ‘‘ gum,’’ all of which it was clear had flowed 
from the bark, and most from the inner bark. ) 
(2.) (See diagram.) This was a slit made with a sharp pocket- 
knife, about 1 ft. long and lin. broad, just penetrating to the wood, 
and where it cut through the cambium-layer about ~-in. broad, An 
hour afterwards the bark showed white beads of resin distributed almost 
equally over the bark, which is here 2 in. thick and all live bark. There 
is little chance of the borer getting in with such a slit, as the wood 
is only slightly exposed. It was remarkable that after twenty-four hours 
there was as much resin exuded from this narrow cut as from the broad 
Gascony cut. The resin had exuded about equally from the inner and 
outer bark. 
(3.) This was made with a sharp knife, like No. 2—viz., a strip 
about 1 ft. long and din. broad, but instead of going through to the 
wood it only penetrated the outer half of the live bark. This started 
running milky juice similar to No. 2, and after twenty-four hours had 
nearly as much resin exuded. For the size of the eut this was the best 
after No. 4, The slit was full of ‘ gum”? except on the upper part. and 
a streak of “gum” 4 in. long had run down the tree below the slit. 
(4.) This has given by far the best results. - It consisted of four cuts 
with a sharp axe, side by side, through the bark and on to the wood. 
This leaves a slit like a mere crack in the bark. An hour afterwards 
there was a scarcely perceptible appearance of milky juice. But after 
twenty-four hours this, for the size of the slit, showed the best yield of 
resin. Each axe-cut had a long strip of ‘ gum ”’ running out below it; 
one of these 22 in. long, }in. broad, and lin. thick. From these four 
