Otago Institute. 447 



Mr. G. M. Thomson's list would soon be doubled ; but some of the plants on 

 that list he thought should be considered as New Zealand plants, such as 

 Folygonwm aviculare and Sonchus oleraceus. He had noticed in and near the 

 rivers in Canterbury Nasturtium ampldbium and A nacharis alsinastrum ; . 

 these plants spread from America and Southern Europe into Northern Europe 

 in exactly the same way. Most of these plants, he thought, would continue ; 

 and even the injurious ones would be more difficult to keep down by cultivation 

 than they were in Europe, on account of good climate. With reference to the 

 appearance and disappearance of thistles, he remarked that in Sweden, when 

 the forest is cut down and burnt, Geranium hohemicum appears, no one knows 

 whence ; but in a few years it disappears, and never comes again. In the 

 same way, when land is first broken up for cultivation, it comes, but soon goes 

 again. 



Captain Hutton exhibited a collection of Hepaticse made by Mr. Kirk and 

 himself on the Great Barrier Island. 



Dr. Berggren remarked that the difference was very small between them 

 and those that he had found in the South Island. In many of the New 

 Zealand genera the development is not known, and the structure has not been 

 studied ; but when this is done it will throw great light on the classification of 

 the order. He referred particularly to Petalophyllum, Steetzia, and Symphogyroa. 



Captain Hutton exhibited a sea trout {Salmo trutta) caught in Otago 

 Harbour, and stated that another liad been recently caught. 



Mr. Webb stated that Mr. Young, of Palmerston, had informed him that 

 1 40 sea trout, hatched from Tasmanian ova, were turned into his pond early in 

 1871, of which about 120 were let into the river in 1872, and there could be 

 no doubt that these were some of that lot. 



