612 NOTES AND EXHIBITS. 



Dr. Tillyard showed a collection of Canadian Lacewings and 

 Caddisfiies, presented to him by Dr. A. J. Turner. Also a large 

 Dragonfly {Petahira gigantea Leach), picked up on the pavement 

 outside the Society's gate on the 25th inst., in an exhausted, but 

 otherwise uninjured condition — a stray from the Blue Mountains 

 under the influence of westerly winds. 



Professor H. G. Chapman, on behalf of Miss M. Lilley and 

 himself, exhibited some samples of yeast, on which observations 

 had been made on the rate of multiplication of the yeast-cells, 

 on the amount of sugar present, and on the production of alcohol 

 and carbon dioxide. The figures obtained showed that most of 

 the growth of the yeast occurred before the decomposition of 

 crlucose into alcohol and carbonic acid fjas. 



