514 EXPERIMENTAL RESEARCHES WITH CHICKEN-CHOLERA MICROBES, 



of corrugated galvanised iron, the space between the sheets of the 

 walls being filled up with sawdust in addition to a lining of felt, 

 contained four rooms, and was fitted out with what appeared 

 necessary. Gas was produced on the Island itself, out of gasolene, 

 through a Miiller's " Alpha Gas Making Machine," ordinary coal- 

 gas across the water not being obtainable."^ Water-pipes were 

 laid on, the water supplied being rain-water collected in iron 

 tanks. On one free side of the laboratory, under the verandah, 

 arrangements were made for accommodating a large number of 

 rabbits. 



In the centre was erected a large enclosure, covered in all over 

 with fly-proof wire-gauze in connection with wide-meshed wire- 

 netting. This enclosure measured 100 feet (about 30 J metres) in 

 length, and 80 feet ( 24| metres) in width ; it was slightly cut ofi 

 at the corners. Most of the surface-area consisted of loose soil, 

 in which artificial burrows could easily be dug (as will be seen 

 later on) ; a small portion only being taken up by rocks (f^and- 

 stone), which were partly on a level with the soil-surface, partly 

 more or less projecting. There were a few small trees (gums, 

 geebung) preserved in this enclosed place. 



Adjoining one of the shorter sides of this main enclosure, was 

 a large shed covered all round with corrugated iron, and having a 

 brick-basement ; at the rear of this shed was a number of pens 

 and stalls. 



In one corner of the Island, towards the water-edge, was an 

 aviary, 15 feet (about i^ metres) square. One, the southern, 

 half of it was covered at top and sides with sheets of galvanised 

 iron ; the other, northern half, only with wide-meshed netting and 

 fly-proof wire-gauze. The greater portion of the aviary was 

 accessible to the sun for nearly all day. 



A dwelling-house, with belongings, completed the collection of 

 buildings on Rodd Island. 



* See my communication "On 'Air-gas' for Bacteriological Work ;" 

 these Proceedings, Vol. IV. (2nd Ser.), p. 328. 



