AMSTERDAM, October 1917, 



Sir. 



On the 16th. of February of the coming year Professor 

 Dr. HUGO DE VRIES, will have completed his seventieth year. 

 He will therefore, according to Dutch Law, have to retire 

 from his professorship at the University of Amsterdam at 

 the close of the Academic year 1917/1918. 



The Dutch Botanists consider that they cannot allow 

 this occasion to pass without presenting the genial scholar 

 with a proof of their esteem and veneration. They have 

 consequently formed a committee which has assumed the 

 pleasant task of making and carrying out suggestions for 

 the purpose and to collect the necessary funds or promises 

 of support . 



The principal of these plans as far as the foreign 

 admirers of Professor Hugo de Vries are concerned is the 

 project of the Committee to republish in book form the col- 

 lected essays of de Vries which have not appeared or cannot 

 be purchased separately and are only to be found scattered 

 in numerous and varied periodicals, frequently difficult to 

 obtain . 



The scientific importance of such a project need 

 scarcely be emphasized and the Committee will be glad to 

 receive your support in carrying it out. A subscription 

 form is attached on which a complete set of the collected 

 essays can be ordered either for yourself or on behalf of 

 your inst i tute . 



The very moderate price, viz. F. 45. — (Dutch Currency) 

 for a work of six volumes of about 550 pages each, with 19 

 coloured and numerous black plates, and as the publication 

 of the entire work will cover at least three years, only 15 



