REVIEWS. 



these papers, Mr. Lawson confirms Mohl's view of the colouring matter in 

 S. reginae viz., that the blue colour of the flower is not diffused colour, 

 but appears in the shape of spherical granules ; and that in the yellow 

 leaves the pigment has, as Mohl expresses it, the form of slender, crescen- 

 tically-curved, and irregularly-wound fibres, which swim in the cell sap. 

 Mr. Lawson adds, that it, however, occasionally occurs in globular bodies. 

 In the latter paper we have a very careful and detailed account of the 

 occurrence of Cinchonaceous glands on the interpetiolar stipules of the Gali- 

 acea?. Hitherto these glands were considered quite peculiar to the natural 

 order Cinchonacese, and have even been employed as a character to distin- 

 guish that order from Galiaceae. However, Mr. Lawson has discovered that 

 they are present in every plant of the order he has examined amounting, 

 on the whole, to no less than twenty-seven species and, we think, he may 

 fairly conclude their general occurrence in the order. The paper concludes 

 with reviewing the reasons for keeping those two orders separate. Both 

 these papers are of exceeding interest to botanists, and we are glad to see 

 them published in a separate form. 



THE SEA-WEED COLLECTOR'S GUIDE. By J. Cocks, M.D. With a Plate, 

 coloured. Price 2s. 6d. London : John Van Voorst. 1853. 12mo. 

 Pp. xvii., 120. 



WE have in these pages a really useful, because practical, guide for the 

 collector of our Marine Algae, and which we feel will be gladly welcomed 

 by all who admire the elegant varieties of form to be met with in this 

 most interesting and beautiful order. We can remember how gladly we 

 would have hailed such a manual when, for the first time, we endeavoured 

 to preserve some of our favourites for future examination, and saw how far 

 our attempts were from keeping the characteristic features of those we 

 were most anxious to preserve. With Dr. Cocks's name British Algseologists 

 are already well acquainted ; and few collections of our Algas, of any size, are 

 to be found, in which specimens put up by him may not be recognised by 

 their exceeding beauty and perfection ; and we only regret that their 

 merits are not better known and appreciated. We, however, have some 

 reason to hope, that in the course of the present year, Dr. Cocks will issue 

 to subscribers, at a moderate price, sets of British Algae, arranged in 

 fasciculi, in accordance with the PhycologiaBritannica; and we can scarcely 

 conceive a greater boon to the student than such a companion to the noble 

 Monograph of Professor Harvey, or one that would find a readier support 

 from all who are attracted to our coasts in search of health and pleasure. 



