L. OCCURRENCE OF LIVING ORGANISMS IN ARTESIAN WATER. 
a strong close net, so arranged as to catch a portion of 
the column of water as it descends, is all that is necessary. 
Probably the most suitable and convenient thing for the 
purpose would be a sieve of fine mesh, say 20 to the inch. 
Everything caught in this should be put as soon as possible 
in a suitable preservative. The best and most convenient 
preserving fluid for use in this way is either a weak 
solution of formalin (2%) or sublimate alcohol (a solution 
of corrosive sublimate in 50% alcohol). 
For the collection of smaller and more delicate objects, 
a plankton net of the kind used for the collection of small 
marine and fresh-water surface organisms will be neces- 
sary. The form of plankton net which I have been using 
of late—one described by Charles A. Kofoid’—is well 
adapted to this special purpose. It is constructed of Swiss 
silk bolting-cloth, and has a detachable copper bucket; but 
the latter is not absolutely necessary, and a deep conical 
net of the material mentioned, or of fine Indian muslin, will 
serve the purpose sufficiently well. 
As it would be inconvenient or impossible to suspend a 
net of this kind under the heavy falling column of water, 
a sheet of galvanized iron should be so arranged as to form 
a ‘“‘catchment area’’ for the net. The sheet should be 
folded longitudinally in such a way that the two halves 
meet at an open angle. It should be supported in sucha 
position that one end of it should be below a portion of the 
falling water, while below the other end serving as an 
outlet is suspended the net, the slope of the sheet of iron 
being such that anything contained in the water will be 
swept down into the net. 
By the kindness of Mr. J. W. Boultbee I was enabled in 
1900 to get some trials made by means of such a plankton 
net of the water of the Tenandra bore near Warren. These 
1 Jcurnal of Applied Microscopy, Vol. 1., p. 111. 
