The N.Z. Journal of Science and Technology. 
192 
[May 
Apparatus for treating ores and other materials under pressure. Hovland. U.K. 
100545. 
Manufacture of a porous mineral product for use in chemical and electrical operations, 
as a refractory material and other purposes. Barrett. U.K. 108619. 
Treatment of clay. Feldenheimer. U.K. 108808. 
Manufacture of titanic-acid products. Wade Titanium Alloy Manufacturing Company. 
U.K. 108693. * 
Manufacture of titanic-acid pigment products. Wade and the Titanium Alloy Manu¬ 
facturing Company. U.K. 108875. 
Manufacture of red lead and orange lead. Rowe. U.K. 108735. 
Manufacture of anhydrous magnesium chloride alone or conjointly with other metal 
chlorides. Ashcroft. U.K. 108920. 
Manufacture of anhydrous magnesium chloride. Ashcroft. U.K. 108755. 
Process for extraction of borax from mixtures containing boric acid or borax and sodium 
sulphate. Deutsche Gold- und Silber Scheideanstalt vormals Roessler. U.K. 
107019. 
An alloy. The Electro Metals Products Company. Cooper. U.K. 109176. 
CORRESPONDENCE. 
Naturalization of Animals and Plants. 
Sir, —For many years past I have been accumulating materials for a 
History of the Naturalization of Animals and Plants in New Zealand, and 
have got a large mass of information ready for publication, but—like other 
non-essential matters—this must be delayed till the war is over; Mean¬ 
time I am desirous of still adding to my store of facts, for at every turn I 
meet with people who can tell me something hitherto unknown to me on 
the subject. A vast amount of information is already lost, the pioneers 
of settlement having passed away without, in most cases, recording their 
observations on natural phenomena. But it is desirable that some concise 
record of this interesting branch of natural history should be kept, and I 
would ask readers of this Journal who have any information on the subject 
which they think has never been noted if they will communicate with me. 
Such a record has never before been made in any country of any size, 
because it has not been possible to do it elsewhere. But New Zealand is 
unique in this respect. The first European voyagers to this country included 
scientific men, who recorded what they saw, and also (as far as they knew) 
what they introduced. So the later settlement of the country and the vast 
changes which have taken place in its fauna and flora during the past 
hundred and fifty years can be followed to a large extent. I have been able 
to amass a good deal of information, and would be glad to make the record 
as complete as possible. 
The record refers not only to plants and animals which have been intro¬ 
duced and naturalized, but also to those which have not succeeded in 
establishing themselves, for this is as interesting to the naturalist as is 
the case of those which are now “ wild ” in the country. 
It may interest the readers of the Journal to know that the record deals 
with over six hundred species of animals, and fully as many plants. The 
former range from the mammalia down to and including the worms, my 
last entry referring to the medicinal leech; and the latter include all groups 
of flowering-plants and ferns. 
Geo. M. Thomson. 
99 Eglinton Road, Dunedin. 
By Authority: Marcus F. Marks, Government Printer. Wellington—1918. 
[2,000/4/18—4898 
