Mr. E. Marriott on Gelatino-Chloride Papers. 341 



noxious creature has become exterminated there it has become 

 exterminated also. It is obviously absurd to suggest as merely 

 plienomenal coincidences such cases as these, when certain 

 creatures only exist under mimetic forms, which vary in colour 

 and pattern according to the colour and pattern of the distasteful 

 creature in every locality where they exist together. 



In conclusion, I wish to point out that I have only been trying 

 to show you some of the extraordinary cases of protective 

 mimicry ; but as to how the thing is brought about, no one can 

 say, because nobody knows ; all that one can do is to observe 

 Nature closely, and make deductions. That Nature is always 

 working for the protection and preservation of the creatures it 

 contains I think our common sense tells us. The key-note of 

 the whole theory of evolution which the great Charles Darwin 

 brought to hght is the great struggle for life which is always 

 going on around us, the survival, in fact, of the fittest. And the 

 more one thinks, and the more one observes, the more you 

 become impressed with our own extreme insignificance, and with 

 the wonders of the work of the great Creator. 



100. — Gelatino-Chlokide Papers. 



By Edw. Marriott. 



(Read before the Photographic Section, October 2nd, 1891). 



During the past four or five years the sale of gelatino-chloride 

 paper has increased wonderfully : four years ago it was very 

 little known amongst amateur photographers. In Germany it is 

 extremely popular, and in America the demand for it is enormous. 

 At last our English manufacturers are waking up to the fact 

 that there are trade possibilities in this line, and we need no 

 longer send to Germany for our supplies, and Mr. J. Fallowfield, 

 the Blackfriars Co., and the Ilford Co., are producing it. 



Two years ago, as far as I can make out, there were only two 

 kinds on the market. To-night I have prints from seven kinds 

 for your inspection : Obernetter, Leisegang, Aristotype, Celero- 

 type, Fallowfield's, R. Talbot's, Adams' Luminotype, and the 

 Ilford Paper. I print them rather deeply, and without any 

 washing the prints are transferred to the combined toning and 

 fixing bath. I have had no experience with any other bath, 

 although equally good results are obtained by their use. I know 

 that the one I use works well, keeps well, and will tone any 

 paper or transparency that requires it. I have with me two 

 lantern slides to show the difference in colour produced by this 



