THE H[STOEY OE THIS WOEK. IX 



once to work up tiie synonymy of those species so far 

 as could be done before the figures and descriptions of 

 them were to hand, I thought that the volume would 

 be ready by the end of the year for which it was to be 

 issued, but the descriptions of the species were only 

 completed at the end of that year and were received 

 by me on 1st January, 1909. Several species described 

 were not in the previous list, and working up the 

 bibliography for these and completing it so far as 

 possible for the rest has taken all the time that I could 

 spare for it until I was able, on 9th August, to com- 

 mence to send the MS. to the printers. 



In the meantime a sad event occurred. Mr. Cash 

 was taken ill about the middle of January and died on 

 the 20th of February. I had sent proofs of the plates 

 to him early in that month, but believe that he was 

 then too ill to look at them, and they lack the careful 

 revision which they would doubtless have received 

 from him ; so also does the text. 



I have only once met Mr. Cash. In June, 1908, he 

 was staying at Criccieth and I at Capel Curig, North 

 Wales, and one day we met by arrangement at Pont 

 Aberglaslyn and had about an hour's walk and talk. 

 It was then that we decided to conclude the present 

 volume of the work with the Arcellida, and to leave 

 the Conchulina Filosa to the third volume, the reasons 

 for this being that so much work had to be done to 

 that group that the issue of the present volume would 

 be too greatly delayed, and that so much additional 

 material had accumulated that the remainder of the 

 Arcellida would make a volume equal in extent to the 

 first volume and would require the same number of 

 plates. It was then also that Mr. Cash first expressed 

 his doubts as to the possibility of treating of the 



