130 PHOTOGRAPHY FOR NATURALISTS. 



dragonfly in flight, for instance would, even if it were 

 possible, be ridiculous. As examples of pictures to 

 which an exposure of some seconds was given, and which 

 nevertheless suggest movement in the subject, those on 

 pages 27 and 109 may be cited. The general conclusion 

 would appear to be that, even in the case where we 

 would suggest " movement," time exposures have a 

 certain value, and instantaneous exposures an 

 uncertain one. The natural perversity of things has 

 arranged that the former shall be the more difficult 

 of execution. 



The question of a printing process which shall be 

 adapted to all kinds of natural history illustration fur, 

 scale, and feather has already been dealt with at some 

 length. It is general practice with amateur carbon 

 printers to have a supply of easily worked print-out 

 paper at hand with which to obtain some notion of the 

 printing qualities of their negatives. The employment 

 of silver P.O. P. results, in the writer's experience, in an 

 accumulation of essays which have not been worth the 

 trouble of toning and fixing separately. As the evil 

 day is deferred, the quality of these prints, some of 

 which might have been worth preserving as Christmas 

 cards, naturally deteriorates. The need is indicated of 

 a process which will give a permanent result with a 

 minimum of trouble. The nearest approach to this, in 

 the writer's judgment, is effected by the use of print-out 

 platinum paper. That supplied by Hardcastle, of East 

 Street, Brighton, deserves to be better known. The 

 print merely requires fixation in water slightly acidulated 



