MONOGRAPHIE DER GATTUNG EUPHRASIA. 369 tending to exterminate rare species, may I say that the following rule has been drawn up for the Moss Exchange Club: — "Great care should be taken not to injure or exterminate any rare or local species. If a plant only occurs sparingly, not more than one or two specimens should be taken. Often a whole tuft {e. g. of Sphagnum) is destroyed, whereas greater care might have obtained a specimen and left the original tuft httle the worse. Localities near towns or where there is any danger of a rare species being exterminated should not be too definitely pubhshed." One often sees ironical remarks in Reports of Exchange Clubs on account of the small number of specimens sent. It would be well also to caution beginners against taking too many in the case of a rare species. — C. H. Waddell. NOTICES OF BOOKS. Monographie der Gattung Euphrasia. Von Dr. R. v. Wettstein. 4to, pp. 316, tt. xiv, 3 maps. Leipzig, Engelmann. 1896. Price 30 marks. In this very complete and excellent monograph Dr. R. v. Wett- stein has given the history, nomenclature, physiology, and biology of these closely- allied species in a most thorough and painstaking manner. The descriptions of the eighty-seven species are very clear, and the difficulty of diagnosing the critical forms is much lessened by the clavis, and by the excellent drawings of the calyx, flowers, &c., which are to be found on the clearly-engraved plates. Eleven of the species are stated to be found in Britain ; they are as follows : — E. STRicTA Host, Flora Amir. ii. 185, which is figured as E. ojicinalis in Hayne, Arzn. ix. t. 8. It is the E. nemorosa Reichb. Fl. Exc. 358 (not of Persoon), the E. ojicinalis var. nemorosa Koch, Syn. Fl. Germ. 545, and the E. ojicinalis var. vulgaris Benth. in DC. Prod. x. 552. Of this species Dr. Wettstein has seen specimens from the Surrey Downs. E. BOREALis (Townsend, as a var. of E. Fcostkoviana) Wettstein, which was described as British by Mr. F. Townsend from Braemar specimens, and is recorded from the Faroe Islands by Dr. Wettstein. The writer has gathered it in Argyll, Ross W. and E., Easterness, Westeiness, Perth, and Sutherland ; and at Kenmare and Port- marnock in Ireland. E. BREviFOLiA Bumat et Gremli ; Towns, in Journ. Bot. 1884, 167. This is, according to Dr. Wettstein, the E. ojicinalis var. moiitana Fries, Summa Veg. Scand. i. 19. Mr. Townsend sent Dr. Wettstein specimens of it from Buxton, from Foyers (Inverness- shire), and from Argyll. Dr. Richter is stated to record it from the "Drosachs" (the Trosachs in Perthshire). E. NEMOROSA P'ers. Syn. ii. 149. This is reported from " Horning- ton " (Honington), Warwickshire, F. Townsend; Portland, Groves; Wokingham (Berkshire), and York. It is a freq[uent form in Berk-
