192 PROCEEDINGS OF THE ROYAL SOCIETY OF QI •EENJ;LAND. 



(ii) BuUoo River. — Weather records for Adavale shew that 

 June and July 1917 were drier and colder than the noimal, 

 being, however, only verj^ slightly colder for July. The out- 

 break was re^Dorted in August but probably began in July. 

 June 1918 was again colder and drier than normal. The 

 epidemic began about the end of July and ceased after a hcsh 

 had occurred in the river in August. It reappeared in August 

 1919. 



(iii) Mclntjjre River. — With regard to the epidemic occur- 

 ring in the Mclntyre and Severn Rivers during July and 

 August 1918, the records shew that during June and July both 

 minimum and rainfall records were considerably below the 

 normal. The river was very low until rain fell in August. 



(iv) Mary River. — Gympie weather records shew that June 

 1917 was colder and drier, and July 1917 much colder and 

 drier, than the normal. An epidemic was reported to have 

 occurred in the Mary River in August and September of that 

 year. 



June and July 1918 were both still colder and drier than in 

 the preceding year, but no epidemic followed. 



(v) Burnett River. — For the last ten days of June 1918 and 

 the first eighteen days of July frosts were experienced jDracti- 

 cally every night (twenty nights) at Eidsvold. We are indebted 

 to Dr. T. L. Bancroft for allowing us to use his records. 



(vi) Georgina and Diamantina Rivers. — The outbreaks 

 took place in September, October, and November 1917 and from 

 June to September 1918, but none occurred during 1919. 

 Though the epidemic made its appearance during the dry 

 weather, conditions were not those of drought. Many local 

 people thought that cold was the cause of the trouble. 



From the foregoing it will appear that cold is not a neces- 

 sary factor though it was a ver}^ common concomitant. Neither 

 is drought a necessary condition, though dry weather appeared 

 to be common to nearly all the outbreaks. 



One can, however, state that dry cold conditions, and 

 especially abnormally dry weather, favour the epidemic, and 

 that the advent of sufiticient rain to set the rivers in motion 

 te minates it. 



Heath (1883) found that certain species of fish were able 

 to survive after having been frozen in blocks of ice fo: a few 



