188 THE AMERICAN MONTHLY [June 



into animals a large majority produce no appreciable 

 effect. It is now known, however, that upwards of 

 thirty species are capable of nourishing themselves in 

 animal tissues. No species is pathogenic in all animals 

 but each only in certain kinds. The anthrax bacillus 

 grows well in sheep but refuses to grow when planted in 

 dogs and cats. Hence, the behavior of a given species 

 when inoculated into different animals, is another means 

 of differentiating the organisms. — St. Louis Medical 

 Review. 



Algae found at Roche Abbey, July ii, 1896. 



By J. NEWTON COOMBE, 



CHAIRMAN OF THE SHEFFIELD SCHOOL BOARD. 



The result of my microscopical examination of the 

 gatherings taken from the Sandbeck Lake, and from the 

 'Wishing Well' and Lake at Roche Abbey, on the occa- 

 sion of the Yorkshire Naturalists' excursion there on the 

 11th of July, 1896, has been eminently satisfactory as 

 regards the Diatomaceae, which were the objects of my 

 special investigation. Taking the above-named waters 

 in the order in which they were visited, the well-khown 

 water weed (Myriophyllum) which grew very freely in 

 Sandbeck Lake, and for a tube of which I am indebted to 

 the courtesy of Mr. J. Stubbins, of Leeds, proved to be a 

 favorite habitat foi- the following stipitate species of the 

 Diatomaceae : — Cocconema cymbiforme, Gomphonema 

 curvatum, G. constrictum, Achnanlhes exilis, as well as 

 of the needle-like Syuedra radians, and the curious tube 

 dwelling and somewhat uncommon Encyonema prostra- 

 tum, the frustules of which last-named species move and 

 pass one another up and down their hyaline mucous- 

 made tubes in very curious jerky fashion. 



The parasitic members of the family were well repre- 

 sented on the same weed by Cocconeis placentula, which 

 appears like so many small lozengers stupk a|| Qver and 



