122 



d. Colour, 



During the years, the terms used by the artist and botanist for the anthocyanin 

 colours of hypocotyl, cotyledon, &c, have varied. No tint should have been quoted 

 except with quotation of a standard reference- work on colours. That has been quite 

 out of the question with the time at my disposal, and doubtless some future student 

 will carefully record these colours, and draw conclusions from his researches. In the 

 notes on seedlings, red sometimes means crimson and pink, and there are doubtless 

 other synonyms. Purple is also a term which covers much variation. (Some 

 observations on the colours of the young shoots, or " young foliage," will be found 

 at Part LVI, p. 331.) 



The undersurface of the cotyledons (cotyledonary leaf) varies in colour according 

 to local conditions, e.g., time of year, moisture, soil. This is probably true of other 

 parts of the seedling. 



In a number of cases the colours in seedlings of the same species (or reputed 

 to be such) from different localities are reported to be uniform ; in some a difference is 

 reported, but what interpretation is to be put on these reputed differences, if any, is 

 a matter for further observation. 



e. Glaucescence. 



The seedings of some species, other than those whose mature leaves are glaucous, 

 display glaucousness in varying degrees. Sometimes the glaucousness is hard to 

 detect, as it may shade into paleness in which no waxy surface is evident to the eye. 

 The term sub-glaucous is an intermediate one, and somewhat vague. For references 

 to glaucescence in both young and mature foliage, see Part LVI, p. 328. 



f. Measurements. 



These have been rarely given. Lubbock gives them in the few species he 

 examined, but as I submit coloured drawings (and hope to reproduce more), I consider 

 they will afford sufficient data for the present. 



The sizes of the component parts of seedlings actually given are those of jjot- 

 grown ones. Speaking generally, it seems to be a fact that those grown in the open 

 (i.e., naturally grown) are larger; but I have not made a rigid series of comparisons. 

 The whole question of measurements could form the subject of a useful research. 



I have given localities or numbers after a description, so that the origin of the 

 seedlings can be traced. It is purely a herbarium memo. Where there are no such 

 indications, only one locality is known for the species. 



