" Multiple Evaporation." 



a friend made the following novel and probably good 

 suggestion ; to draw the deleterious gas from the top of 

 the calandrias into, and discharge from separate small 

 vacuum receivers. 



Why the calandria water from some cane juice is 

 more vicious than others is a mystery, this difference is 

 well illustrated by the following examples taken from 

 yellow sugar fa6lories. 



On both Aurora and Perseverance^ wrought iron 

 connexions are partly used to carry the calandria water 

 to the pumps, these pumps are made of cast iron with 

 wrought iron valve guards and nuts (these are pra6lically 

 as perfeft to-day as when ere6led) in the former case 

 twelve, and in the latter case four years ago ; corroded 

 tubes and other parts of the triple apparatus have never 

 been experienced on these estates, see the sample tube 

 (A) cut from the Aurora evaporator after twelve years' 

 work; you will notice that it is in pra6tically good con- 

 dition for another twelve years run. On the other hand, 

 there are estates on which we too well recognise the 

 destructive a6livity of the calandria vapour and its very 

 definite lines of a6live corrosion and destru6lion, inva- 

 riably on the top of the calandrias as pointed out by Mr. 

 Cornish, and particularly on the side remote from the 

 entrance of the vapour. For instance, the triple ef¥et 

 tubes of both Taymouth Manor and Hampton Courts 

 have during eight years been corroded twice in the parts 

 of the calandria's remote from the vapour entrance ; no 

 longer ago than to-day two W. I. stay rods (D) and (E) 

 were taken out, these during only a few months' work 

 have been corroded from one inch down to half-an-inch 

 in diameter ; just one-half the original area. These rods 



