1 60 CORRESPONDENCE. 



Diatoms on the Surface of the Sea, from Java and also from the 

 Arctic Sea, have been very admirably figured and described in English 

 by M. P. T. Cleve, in a couple of pajiers, which were originally j)re- 

 sented to the Swedish Academy of Sciences last year. With them 

 has come to us a paper in Swedish, also read before the Swedish 

 Academy of Sciences about the same time, by M- N. G. W. Lagerstedt, 

 on the " Diatoms of Spitzbergen." This is illustrated by two good 

 plates, and though the general observations are in Swedish, the 

 description of the species found is in Latin. 



COEKESPONDENCE. 



An Ereor in Mr. Morehouse's Paper. 



To the Editor of the ' Monthly Microscopical Journal.' 



Ashtabula, Ohio, U.S.A., July 17, 1874. 



Sir, — In the article on the " Structure of Diatoms," by Mr. Geo. W. 

 Morehouse, reprinted in your June number, I notice an error which 

 occurred in the original text. 



The last footnote, p. 23, should read " J. E. Smith," &c. 



As many of your readers may not have access to the ' Lens,' I 

 desire to say that the observations referred to were made by me in 

 January, 1873 ; the objective used was a superb Tolles' immersion 

 one-tenth (-Jjj^th) — amplification about 4000 diameters. 



These observations were very shortly afterwards confirmed by 

 Mr. Morehouse. 



I remain, Sir, your obedient servant, 



J. Edwards Smith. 



The Pathological Anatomy of the Brain and Dr. Kempster. 



To the Editor of the ' Monthly Microscopical Journal.'' 



Royal College of Physicians, Edinblegh, August 18, 1874. 

 Sib, — I have this moment seen your notice of Dr. Kempster's 

 observations on the pathological anatomy of the brain in the insane ; 

 in it, it is said that Dr. Kempster has only been able to find one 

 exception to the silence which physicians have maintained on this sub- 

 ject, and that one paper by me is the excej^tion. 'V\ ere Dr. Kempster 

 to search with anything like care, he would find that there have been 

 many workers in the field both in Great Britain and the Continent, 

 that my contributions are numerous, and that his own observations 

 have been anticipated by many men and many years. 



I am,|^Sir, yours truly, 



J. Batty Tuke, M.D., F.E.S.E. 



