ABSTRACT OF PROCEEDINGS. 



XX111. 



gases produced by fires in the Gunnedah and Greta Collieries, the 

 latter was an old gob. fire. The analyses were as follows: — 

 Return Air-Way, Wallsend Colliery- 



Oxygen 

 1.— 20-03 

 2.— 19-32 

 3.— 19-28 

 4._20-03 



co 2 



0-19 

 0-27 

 0-31 

 0-24 



N. 

 79-78 

 80-41 

 80-41 

 79.73 



Air from holings Bur wood Colliery — 



Oxygen 

 1.— 20-42 

 2.—20-77 

 3.— 20-83 

 4.— 20-34 



C0 2 

 0-08 

 0-04 



0-13 



N. 

 79-50 

 79-19 



Deficiency of 



o. 



0-85 

 1-55 

 1-59 



0-85 



Deficiency of 



o. 



0-48 

 013 

 0-07 

 0*56 



Excess of 



co 2 



016 

 0-24 

 0-28 

 0-21 



C0 2 

 0-06 

 0-01 



0-10 



79-53 



Air from sealing, Gunnedah Colliery — 



Oxygen C0 2 N. 



1 — 15-88 ... 1-46 ... 82-66 



2—16-93 ... 1-04 ... 82-03 



3—13-68 ... 2-09 ... 84-23 



4—15-79 ... 1-45 ... 82-76 



From old gob. fire, Greta Colliery — 



1—10-50 ... 2-14 ... 87-36 



2—10-60 ... 2-17 ... 87-23 



The authors described the conditions as to temperature and air- 

 current, etc., under which the samples were taken, and their 

 bearing on the subject of the ventilation of coal mines. The" 

 analyses were compared with published analyses of air in the 

 return-ways of English collieries made by Dr. Haldane, and the 

 question of the effects of diminution of oxygen, presence of carbonic 

 acid, black-damp and other injurious gases found in the air of 

 coal-mines, discussed in relation to their action on men and lights. 

 A discussion followed in which several members took part. 



2. "Symmetrically distorted crystals of Cassiterite from Western 

 Australia," by W. G. Woolnough, b.Sc, f.g.s. 

 The crystals were collected at Cooglegong, Pilbarra, W.A. by 

 Mr. B. F. Davies, b.Sc, (London), who kindly allowed them to be 



