On Salmon-Pry, 951 



water, the height of which rapidly increases when large 

 jars are filled, and require continual removing. 



When large quantities of gases are required, as in public 

 lectures, this^ pneumatic table has been found exceedingly 

 useful , 'I'he operator not being restrained for room in the 

 jqnanagement of his experiments, nor being obliged to trans^- 

 fer the vessels continually in and out of the apparatus, and 

 being enabled to perform his operations within a con- 

 fined space and without encroaching upon any surroundittg 

 furniture, are likewise no small advantiiges, which entitle it 

 to the attention of those who have no access to the la- 

 boratory of the operative chemist. 7'he shelf yy* is very 

 ferviceable as a receptacle for holding whatever utensils 

 may be deemed necessary to be near at hand during the 

 experiment. 



Compton Stree>j Soho, March 12, 1810. FREDRICK AcCUM. 



XLIfl. On Salmnn-Fry : in Jmiuer to a Correspondent 

 whose Communication appeared in our last Number, By 

 JojHN Carr, E,sq.^ of Manchester*, 



To Mr. Tilloch. 



/Sir, a liberal discussion of subjects in British natural 

 history certainly affords a very amusing variety amongst 

 the (more abstruse branches of scientific research, which 

 obtain so deserved a preference in your select journal ; and 

 it is with this view that I submit my present observations, 

 rather than from a wish to attain any triumph over the 

 brief and illusory remarks on Salmon-leaps, in your Maga- 

 zine for last month. What I formerly stated, and shall 

 now offer, is the result of my own personal observations 

 in the Tweed, Coquet, Tyne, Eden, Esk, and several other 

 northern rivers which swarm with salmon, and I mention 

 this only as increasing the responsibility for what I shall 

 advance. 



Were it really a fact, as contended for by the writer I 

 am opposing, that salmon-fry actually continue upwards of 

 twelve njonths in the same river where they are spawned j 

 then during the summer njonths, (when the streams ar(; 



* Mr. Carr 15 respectfully informed that, if we have not misunderstood 

 his allusion, he is mistaken respecting t^he author of the paper to which he 

 has sent this as an ans-Acr. We have therefore suppresspd his introductory 

 parnj;Yaph.— EiUT. 



