INTRODUCTION. xxvii 



mond of Forfar, N. B. (who is now engaged as a Botanist in the 

 Land Arctic Expedition under the command of Capt. Franklin,) 

 have published two valuable works, each in two volumes, of our 

 Mosses ; and we have referred to these as books of standard 

 utility. It will readily be seen how much superior these collec- 

 tions of specimens must be, in point of accuracy, to the best of 

 plates ; and they have also the advantage of being offered to the 

 public at a much cheaper rate. 



We have given, in an APPENDIX, an account of all the known 

 British species of Hepaticse, with remarks upon their structure, in 

 compliance with the wishes of many of our friends. 



