432 
Scientific Notes. 
palisade, ladders being used to go in and out. These models are first carefully 
built up in clay, in which material all the detail is readily secured, and are 
then cast in plaster, a mould being secured by which they are readily multi- 
plied to any extent. They are then put in the hands of the artists and caiefully 
coloured in solid oil paints to accurately resemble their appearance in nature, 
and in case of restorations or modern buildings, all the little additions are 
made which will give them the appearance of occupation. The Survey is in 
possession of the data for the construction of many more models, and they 
will be brought out as opportunity is given. They have also, in connection 
with the views, multiplied many of the curious pieces of pottery which have 
been brought back from that region by the various parties connected with the 
survey. 
Mr. J. J. Maclaren writes to ask us to correct an error which occurred in the 
review of his work on the “Chemical Difficulties of Evolution,” which 
appeared in the April number of this journal. He says: — “I am not the 
author of the work on Darwin by James Maclaren (published in 1876), to 
which your reviewer refers in his article, and, in so far as he has censured the 
author of that work, he has been under a mistake, and has done that gentle- 
man an injustice. If your reviewer will look at the title-pages and the prefaces 
of the two books, he will at once see the mistake which he has made. As it 
is, the similarity of name, and the accident that the excellent printing and 
paper of the book to which your reviewer refers led me to employ the same 
publisher, have led him into an error of which I am bound to take notice, and 
which I am confident you will wish to correct at once.” 
