Miscellaneous, 313 



tilage, sections of bones and teeth which have been treated with acid, 

 the fibres of the crystaUiue lens, &c. For the preservation of adipose 

 tissue, of the ultimate nerve-tubes, and of the blood-corpuscles, it is 

 not well adapted. Objects put up in it, after a certain time, usnally 

 acquire a brownish-yellow tint. - - -i - - 



biiB ^rroiJeJgrrrnni • / lo albw-llaa 980ilw 



i.,,,..ort,. . , . IV. Solution of Arseniou^Aoid.] ii'^^Aj YjsY odB &i 

 To prepare this solution an excess of arsenious ftiJd^Mbl^8'ft^^^W& 

 water, which is then filtered and diluted with twic^ai milch" W^ler. 

 This fluid is one of the most suitable preservatives for preparations 

 from the animal kingdom ; all the tissues mentioned under the last 

 head, and also the adipose tissue, may be kept unaltered in it ; and 

 as they acquire no yellow colour, or a far slighter tinge, during their 

 immersion, I have of late years accorded a general preference to 

 the arsenical over the creosote solution. - '*'J ^^'i ^^^'^^ '■'^^^^^ ^^'^ ^^^^ 



Jrrfn;i of(,t "tO qoib 15 3o "f^ 8Bfl 



nunojif/Jj-i V V. Solution 0/ Corrosive Sublimate. Hrv briii ^sbila 

 33ot|f<^>»gT jg: prepared by dissolving one part of corrosive' Jfiuflli^J ^ 

 4iiercury in from 200 to .500 parts of water. The strength of the 

 solution must be varied according to the nature of the object to be 

 preserved ; hence it is well, when the required degree of concentra- 

 tion is not ascertained, to put up several preparations with solutions 

 of diiferent strengths. This procedure is especially applicable to 

 blood-corpuscles, which can be preserved unaltered in no other fluid 

 with which I have experimented. Thus the blood-corpuscles of the 

 frog require a fluid containing ^(jth of corrosive muriate ; those of 

 birds a solution of ^^o*^ * those of mammalia and man g^uo^^- 



These solutions are likewise useful for keeping the elementary parts 

 of the brain, spinal cord, and retina, although all these structures, m 

 whatever fluid they are put up, undergo some alteration. Cartilage, 

 and the fibres of the crystalline lens, keep well in these fluids ; but 

 other fibrous tissues lose too much of their transparency when in 

 contact with them. They may be used, however, for preserving 

 'ifauscular fibre, whose cross markings they render more distinct. » 

 '^ ' For preparations of delicate vegetable tissues, and, in general, of all 

 tender organs in which it is desired to retain the starch globules and 

 chlorophyl unaltered, for freshwater Algse, Diatomacese, Coufervae, 

 Infusoria belonging to the division Rotifera, &c., a solution containing 

 :^()th or 3^0*^ ^^ corrosive subUmate is the best preservative with 

 which I am acquainted. 



li^w oo ^I' Solution of Carbotiate of FotaskinnUsm oHT 



This may be made of various strengths, with orife pfttt of tfie gait 

 dissolved in from 200 to 500 parts of water, and is the best material 

 for preserving the primitive nerve-tubes. Other fibrous tissues may 

 be kept tolerably well in it, but become more transparent than in the 

 fresh condition. This is sometimes advantageous, as, for example, 

 when we wish to display the respiratory apparatus of insects with the 

 ramifications of the air-tubes. iUia ^^iiJ^uin io auoiijj'ifiqsrq Ik loi . 



