262 SCIENCE PROGRESS. 



experiences on the " Vega " and other expeditions, he has 

 shown such good judgment that one is almost inclined to 

 forget all complaints. Accessible figures of such Laminarian 

 genera as Cymathere, Ulopteryx, Postelsia, Thalassiophyllum, 

 Agartim, Costaria, Dictyoneurum, all within one book, is a 

 boon to all students who are beyond range of excellent 

 libraries. 



Mr. Setchell's previous work has been so thoroughly 

 good, and his study of the Laminarian Saccorhiza so note- 

 worthy in this respect, that one could scarcely wish a 

 difficult task like this (2) in other hands. There is hardly 

 a group of Algae that surpasses the LaminariacecB in the 

 amount of interest taken in them ; and since no one has 

 attempted a general classification of the order since J. G. 

 Agardh in 1848, with the exception of the contemporary 

 Kjellmanian account cited above, there was an urgent need 

 for such a paper as this one. In addition to the discussion 

 of their distribution, he gives an account of the genera and 

 a systematic synopsis of them. I observe that Adenocystis 

 is left out, but from my examination of Hooker and Harvey's 

 typical specimens, 1 doubt the wisdom of this. He gives a 

 valuable table of the distribution of all the species in defined 

 areas. One cannot but rejoice that Mr. Setchell has had 

 the courage to "lump" species in so satisfactory a way. 

 For example, he properly recognises only one species of 

 Macrocystis, viz., M. pyrifera. There are still too many 

 species of Laniinaria and of Alaria, especially the latter, 

 founded on the most trifling grounds. No doubt they will 

 follow their defunct allies of Macrocystis when the order is 

 monographed. I observe only one omission of interest, viz., 

 Laminaria Schinzii Foslie, which enters the southern 

 tropical Atlantic at Walfisch Bay. A very satisfactory as- 

 pect of this paper is that it gives botanists a claim on Mr. 

 Setchell to monograph the order now that he has put his 

 hand to the plough. 



Prof. Johnson describes (3) and figures an interesting 

 new species, Pogotrichum kibemicum, in a short paper. 

 He gives us a detailed comparison of Litosipkon, Harv., 

 and Pogotrichum Rke. In the course of his corre- 



