IS13.] Chemical Properties of Animal Fluids. 387 



that the circulating hlood is decomposed on the interior surface 

 of the choroidea, leaving there its colouring matter, which is 

 required for the purposes of vision, and conveying the remainder 

 to the inner part of the eye perfectly limpid and colourless. 

 Need I add that the received opinion of the presence of gelatine 

 and albumen in the lens is erroneous? The existence of free 

 lactic acid in the humors of the lens proves nothing with regard 

 to its supposed muscular structure ; hut only shows the presence 

 of absorbing vessels to convey the products of the spontaneous 

 decomposition of animal matter, one of the most important of 

 which appears to be the lactic acid. 



{To be continued.) 



Article XL 



Magnetical Observations at Hackney Wick. By Col. Beaufoy. 

 Magnetical Observations. 



Latitude 51° 32' 40" North. Longitude West in Time 6"-nrcr- 



18)3. 



Montti. 



Sept. 18 



Ditto 19 



Ditto 80 



Ditto 21 



Ditto 'J',' 



Pitt.. 23 



Ditto 24 



Ditto 25 



Ditto 26 



Ditto 21 



Ditto 28 



Ditto 20 



Ditto SO 



Morning Observ. 



Hour, i Variation. 



8'' 55' 



9 00 



8 50 



8 55 



50 

 45 

 52 

 00 

 50 

 50 

 45 

 50 



24° 15' 



24 16 



24 16 



24 14 



24 12 



24 13 



24 13 



24 1 6 



9 03 



2 1 20 



43" 



09 



00 



56 



55 



45 



42 



01 



(il 



li. 



56 



45 



(id 



Noon Observ. 



Hour. I Variation. 



8* 10' 24° 21' 56' 



1 50 24 21 22 



2 03 124 23 32 

 2 15 124 20 33 



2 05 24 21 38 

 2 00 24 22 40 



57 |24 23 07 



2 00 



55 



02 



24 22 4S 

 24 22 56 

 24 24 30 



15 24 23 16 



Evening Observ. 



Hour. 



6 h 00' 



Vai iation. 



24° 15' 12" 



5 55 24 12 02 



6 00 24 15 52 

 6 00 -.'i 14 10 

 5 55 24 15 00 



5 57 24 16 02 



6 00 24 15 44 

 5 55 24 15 50 



5 55 24 17 00 

 5 50 24 17 38 

 5 50 124 17 08 



Moan of 



Oil-. lA.'tlions 



in Sept. 

 Ditto in Aug. 



Ditto in July. 



Morning at 



Noon 



Evening 



' Moining 

 [ Noon 



I .wning 

 Morning 

 | Noon 



Evening 



at 

 at 

 at 

 at 

 at 

 at 

 at 

 at 



8"> 53' Variation 21" 



2 02 .... Ditto 24 



6 03 Ditto 24 



8 44 Ditto 



2 (Vi Ditto 84 



7 05 Ditto 24 



B SI Ditto 21 



1 50 Ditto 21 



7 08 Ditto 24 



'2 I» 2 



West. 



Wot. 



Wert, 



