^ 195 — 



Some detailed diagnoses of herbarium samples will be published in 

 the following division of my paper, as they require a previous explanation 

 of my statistical methods. 



Finally, I désire to express my sincère thanks to everybody who has 

 assisted me in my investigations and in the pubiishing of my results. 

 Especially, Prof. Dr. F. A. F. C. Went at Utrecht, Dr, Ch. Bernard and 

 the Board of the Tea Experiment Station, who always hâve metmywishes 

 with the utmost liberality. Also, to Sir D. Prain, the director of the Kev;^ 

 Botanic Gardens, for his affable réception tnat enabled me to complète 

 my studies in the famous herbarium and extensive library of Kew, while 

 Mr. J. HuTCHiNSON had the goodness to photograph a great number of 

 interesting spécimens for me. Likewise, 1 feel very much indebted to the 

 scientific Nestor of tea culture, Sir G. Watt, who with great care and 

 application furnished me with ail détails wanted, and to the director of 

 the Berlin Herbarium who gave me the loan of the valuable collection of 

 Camellia-specles. Lastiy, I hâve to tender my cordial thanks to Messrs. 

 N. de Forgés Garland and J. C. Valette, managers on the Pamanoekan 

 and Tjiasem Estâtes, Java, for their kind assistance in looking through 

 the manuscript of this English translation. 



The Author. 

 Buitenzorg, February 1919. 



