VI THE HISTORY OF THIS WORK. 



on his return to London, but no further letter could 

 be found. I therefore called upon him, and he 

 entrusted the MS. and drawings to me. 



I found the work to be on the British Freshwater 

 Rhizopoda and Heliozoa, intended to be brought out 

 as a small 8vo volume of about 150 pages with 38 

 admirably executed but uncoloured plates, w r hich in our 

 larger size of demy 8vo could well be reduced to 30 

 or less. It was therefore suitable for a single volume. 

 A letter written to Mr. Tait, the main purport of which 

 was to ask him if the figures or any of them could be 

 coloured, brought a reply direct from Mr. Cash, which 

 is here given. 



" My friend Mr. Tait writes to me with reference to my 

 ' Introduction to the Study of the British Freshwater 

 Rhizopoda/ offered to the Ray Society for publication, and 

 your enquiry as to the colouring of the figures. I am 

 decidedly of opinion that the figures should be coloured, and 

 am so interested in this being faithfully done that I would 

 undertake to submit nearly the whole of the species to fresh 

 microscopical examination for the purpose, during the coming 

 year. Very few would need to he left in black and white." 



This letter is dated 29th November, 1902, and is the 

 commencement of an extensive and very pleasant 

 correspondence with Mr. Cash during the last seven 

 years. In reply I suggested that he should colour a 

 figure as a specimen, to submit to our Council at a 

 meeting on llth December. The day before the 

 meeting I received the two figures reproduced as a 

 frontispiece. Mr. Cash stated that they had been 

 " rather hurriedly executed from pencil memoranda," 

 but they are of exceptional interest as giving the 

 result of his first attempt at coloured drawings of 

 rhizopods, and they are excellent representations of 



