rhomboid lamina, the tip of which is usually reflexed. Numerous glands occupy the median portion of the lamina, the largest of which is placed at the base, and projects with a kind of double head towards the column. Rows of smaller glands reach the tip of the lamina, and at the sides, of the larger ones are smaller stalked calli. Column rather shorter than the upper sepal, broadly winged. North Island: Vicinity of Kaitaia, Mongonui County, R. H. Matthews ! This is a most interesting and unexpected addition to our flora. Mr. Matthews's specimens agree in all respects, with the beautiful plate in Fitzgerald's “Australian Orchids.”

Art. XXXIV.—Plant-acclimatisation in New Zealand By George M. Thomson, F.L.S. [Read before the Otago Institute, 10th July, 1900.] A European botanist landing at any one of the principal ports of New Zealand would be at once struck with the distinctively British facies of the vegetation. Perhaps this impression would be most vividly produced at Lyttelton and Christchurch, and least of all at Dunedin, for here the comparatively good state of preservation of the native bush in and about our. Town Belt, and the proximity of so much high uncultivated land, have left more of the indigenous vegetation than is to be seen in the neighbourhood of any other of our large towns. The causes which have led to the displacement of so much of the native flora as has disappeared, and to the naturalisation of so many foreign species of plants, are numerous and in many cases not easily traceable; the facts themselves are conspicuous enough, even though the explanations may not be forthcoming. In bringing this subject before you I am not going to attempt at all to catalogue our introduced, plants. That, I hope, will be done in the completest manner by Mr. Cheeseman in the Flora which he has now in preparation. What I desire to do is to suggest reasons for the great increase and aggressive character of some forms, and also for the failure of others to establish themselves under, what seem at first sight equally favourable conditions. Why, for instance, should gorse and broom, cooksfoot grass and meadow poa (Poa pratensis), establish themselves so strongly as to become serious pests in many parts, while attempts to introduce many