Mr. V. ZijP consented and so the latin descriptions of the two above named 

 species which certainly belong to the best ones of the paper, are due to 

 our combined efforts. Also about some other species dealt with, Mr. v. Zijp 

 provided me with some valuable information. 

 § 2. Some notes about the descriptions. 



A valuable factor in the descriptions of Zingiberaceae is the colour 

 not only of the flower but also in some genera of the rhizome. This factor 

 is commonly not used in specific diagnoses, very often taken from dried 

 material, where colours of course are not of any use. In Curcuma and 

 Zingiber, however, colour often belongs to the essential diagnostical helps 

 and some species resembling one another very much in a dried state may 

 be distinguished with certitude if the colours have been noticed by the 

 collector (see at Z. Zerumbet). There, however, exists among botanists a certain 

 vagueness in the designation of colours which troubles the clearness of 

 the diagnoses. 



In order to obtain objective designations indispensable in diagnoses I 

 have made use of the "Code des couleurs" by Klincsiek et Valette (Paris 

 Paul Klincksiek, 1908), where 720 colours arranged systematically are 

 indicated by ciphers. 



In this "repertory" Klincksiek accepts 24 principal colours which are 

 obtained by dividing the spectre in 12 divisions, 4 for every simple colour 

 of the spectrum, to wit: red, orangered, orange, orange yellow (yellow, yellow 

 green, green, greenblue) blue, violet-blue, violet, violet red ; which are divided 

 once more each in a more pure and a somewhat nuanced state. These 24 normal 

 colours ("couleurs normales") are diluted ("eclaircies") into 4 degrees, making 

 96 new "tones" and these 120 tones are "abated" ("rabattus") by mixing 

 them with equal portions of black in the same way in 4 degrees. From this 

 proceeding result 24 X 25 = 600 colours (= 100 modifications of each 

 of the spectral colours) which are exposed in 24 double pages each 

 containing 25 colours, and numbered from 1 — 600. 



Each group of 25 specimens contains one of the normal colours placed 

 on the left hand at the top of the page, each of the vertical columns contains 

 the four dilutions and each horizontal column the four abatements of the 

 same colour. Thus pure red is represented by number 1 ; red, nuanced, by 

 number 26; red-orange by number 51; red-orange, nuanced, by number 

 76, orange by number 101 and 126, orangeyellow by number 151 and 176, 

 yellow by 201 and 226, etc. etc. 



Pure red once diluted is 6, twice diluted is 11, thrice diluted 16 etc. 

 Pure red once abated is 2, twice abated 3 etc. 



Pure red once diluted and once abated is 7, twice abated 8 etc. 



Because all the numbers are distanced 1 in the horizontal and 5 in 

 the vertical columns, every number which ends in 1 or 6 belongs to the 



