Preface. ix 



the reader to form an idea of what the different kinds 

 may be like. 



The reader will understand that the grouping of 

 these citrus, is in some cases rather arbitrary, for want 

 of sufficient knowledge of the different varieties. This 

 is the case especially with the lemon group. The 

 smaller varieties resembling the limes proper would 

 form an interesting study for anyone with leisure, and 

 a garden in which he might grow them both from 

 seed, and in other ways. 



The chapter on morphology is entirely speculative, 

 and may possibly be found of little value. In investi- 

 gating- anything, new ideas seem to be called up in 

 oije's mind beyond what is immediately visible. These 

 have sometimes led to new standpoints for further 

 investigations. It does not, however, follow that these 

 new ideas always turn out true, or that it is wise to 

 record them. In connection with these speculations 

 about the citrus, I have entered upon some explana- 

 tions, according to my views, on three allied genera 

 the GEgle, the Feronia, and the Limonia. Outlines of 

 these will be found among the miscellaneous drawings 

 at the end of the Atlas. 



Some specimens arrived after I had arranged and 

 numbered the plates ; I have placed these at the end 

 of each group. For similar reasons, and also because 

 I don't know much about these varieties, I have placed 

 Mr. McLeod's interesting drawings of Assam citrus, 

 and those sent by Mr. Stevenson of Sylhet, all to- 

 gether in the miscellaneous part of the Atlas. 



Some repetition has occurred in the various chapters, 

 but this could not well have been avoided. I thought 

 it preferable to repeat a few sentences here and there 

 than to refer back the reader to what I said before. 



The Appendix may be thought too big. In my 



