188 THE AMERICAN MONTHLY [June 



into an i ma Is a lari^e uiajoiity pioduc*' no appreciable 

 effect. It is now known, however, that uj) wards of 

 tliirty 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 sh«'ep l)ut refuses to grow wlien i)lanted 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. 



Al^ct found at Roche Abbey, July ii. iS()(). 



1!y J. XEWTON COOMBE, 



CHAIRMAX OF THE SHEFFIELP SCHOOL BOARn. 



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 'luly, 1896, has been eminently satisfactory as 

 regards the Diatomaceae, which were the objects of my 

 special investigation. Taking the above-named waters 

 in tlie order in whicli they were visited, the well-khown 

 water weed (Myriophyllum) which grew very freely in 

 Sandbcck Lake, and for a tube of which 1 am indebted to 

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

 favorite habitat for the following stipitate sj)ecies of the 

 Diatomaceae : — Cocconema cymbifoi-me, (T()m])honema 

 ciiivatum, Ct. constrictum, Achnanthes exilis. as well as 

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

 dwelling and somewhat uncommon Encyonema prostra- 

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

 pass one another up and down their hyaline mucous- 

 made tubes in very curious jerky fasiiion. 



The parasitic members of the family were well repre- 

 sented on the same weed by Cocconeis placentnia, which 

 appears like so many small lozengers stuck all over and 



