Vlll THE HISTORY OF THIS WORK. 



sented species which had been described by German 

 authors in papers to which he had not access. An offer 

 to assist him in regard to the literature was accepted 

 in a letter dated 21st February, 1903, in which he thus 

 made the generous proposal that the work should be 

 brought out under our joint authorship : 



" I confess to a sad want of acquaintance with the works 

 of Continental authors on this subject. It is inevitable, as 

 there is no access here, for any student, to the most recent 

 German works on the Rhizopoda. The only one I have been 

 able to see of recent date is JSchonichen and Kalberlah's 

 'Siisswasserbexvolmer,'* in which I find a system of classi- 

 fication substantially the same as Blochmann's,t a copy of 

 which you were good enough to send to me. In the circum- 

 stances, and as it is so necessary to have the work on the 

 British Rhizopoda complete, would it not be well for your 

 name to be associated with mine in a joint authorship ? If 

 you can agree to this it would please me, and be much more 

 satisfactory in the end." 



Although this proposal was at first declined, the 

 amount of work which devolved upon me proved to 

 be so great that it was subsequently arranged that my 

 name should be associated with that of Mr. Cash as it 

 appears on the title-page. 



The first volume was issued, together with the 

 second volume of the ' British DesmidiaceEe,' for the 

 year 1905, in December of that year. 



Coming now to the present volume, arranged to be 

 issued for the year 1908 with the third volume of the 

 ' British Desmidiacese,' I received from Mr. Cash a 

 list of the species to be described in it, with a few 

 references, on 29th October, 1907. Commencing at 



* Referred to in the synonymy as Eyferth's ' Naturgesch. mikr. Siisswass./ 

 the authors named above being the editors of the third edition of Eyferth's 

 work (1900). 



f In ' Mikr. Thierwelt Siisswassers/ 1886 and 1895. 



