470 



strongly recommended, and not only to insect lovers, but tc^ 

 all who collect " pond-life " in any shape or form. It is an 

 exceedingly useful book of reference on the special subject of 

 which it treats, and a careful perusal of the Introduction, deahng 

 with various problems of aquatic existence, and urging the 

 claims of "live Natural History," will be found to open up 

 many avenues for possible original work in connection with many 

 kinds of minute aquatic life. Without going into detail it 

 would obviously be difficult to give a good idea of the many 

 different kinds of insects dealt with, but it may be useful to 

 state that the general plan of the book is to devote a chapter to 

 each of the principal groups to which aquatic insects belong- 

 Water-beetles, Dipterous larvae, Caddis-worms, May-tiies, etc.— 

 thus systematically going over the whole of the ground, though 

 necessarily not dealing with all the known species. D. J. S. 



Subject List of Works on General Science, Physics, Sound, 

 Music, Light, Microscopy, and Philosophical Instruments 

 in the Library of the Patent Office. 6f x 4i in., 18o 

 pages. London, 1903 : Patent Office. Price M. 

 The free library of the Patent Office in Southampton Buildings, 

 Chancery Lane, is undoubtedly well known to many members of 

 the Quekett Club, but it certainly deserves to be known to a still 

 larger number. Probably in no other public library can one see 

 so many books on microscopy and allied subjects all brought 

 together in such a nice quiet little alcove. The absence of all 

 fuss in oetting out books-readers, in most cases, simply having 

 to help'themselves to any book on the shelves-is also a very 

 valuable feature, as it saves an immense amount of time ; and 

 now that this little catalogue has been issued, the usefulness of 

 the hbrary to microscopists should be still further increased. 

 The works contained in the library dealing with microscopy are 

 for the most part grouped under that heading in the catalogue, 

 but a few others are to be found under Polarisation, Photo- 

 micrography, Medical Microscopy, etc. As indicated by the title, 

 many other subject., more or less closely connected with micro- 

 scopy, are referred to in this list, and it may not be out of place 



