; Cockayne. — Development of Seedlings. 361 



degree, and I must express how much indebted I am for his 

 early suggestions. Amongst other things, he raised plants of 

 Veronica armstrongii from seed, caused Ozothamnus micro- 

 phyllus to revert to what I should call its ancestral form, 

 and grew some very curious forms of Baotdia, which are, 

 unhappily, lost. To Captain F. W. Hutton, for assistance 

 regarding literature relating to geological history of our flora, 

 to Professor A. Dendy, for the use of seedHng plants, and to 

 Mr. W. Sparkes, for photographing V. armstrongii for the 

 accompanying plates, I must also beg to record my thanks. 



Part II. : Descriptions of Seedlings, and Notes 



THEREON. 



With regard to the seedlings described here, it may be well to 

 point out that, where nothing is stated to the contrary, they 

 have been raised by myself in the manner and under the con- 

 ditions described in Part I. of this memoir, and so it can- 

 not be held that such seedling forms are identical with those 

 to be found wild. Such wild forms I hope to describe or to 

 remark on when opportunity offers ; and the comparison be- 

 tween these and artificially raised forms, showing the effect 

 of various environments, should be of interest. As for the 

 measurements given below, since the lengths of most parts of 

 a seedhng vary at different periods of its development, such 

 measurements must be looked on as comparative, and serve 

 only to give some idea of the relations in point of size between 

 the different parts of a seedling at some fixed period in its 

 development, and are not in any case a uniform measure for 

 any particular part. Measurements of leaves always include 

 the petiole unless the contrary be stated. With regard to the 

 greater part of the forms described, their development up to 

 the present is not sufficiently advanced to warrant many re- 

 marks ; the further development of such will be of much 

 greater interest ; an account of this I hope to publish in 

 Part III. As for the descriptions, they are drawn up from an 

 examination of all the seedlings raised as far as possible, and 

 are not descriptions of one seedling alone. Many seedHngs 

 die after having been examined, while others must of neces- 

 sity be cut up for examination and so destroyed. Thus it has 

 not been found possible to watch the development in many 

 cases of any particular individual, the further progress of the 

 species having to be noted from the survivors. Besides using 

 herbarium specimens, I have been enabled to compare nearly 

 all the seedling forms with adult plants from my garden. As 

 this garden is of dry sandy soil, considerably exposed to wind 



