CHAPTER VIII. 



,!]',,,, , ally nnf the one which is turned 



. as that will pn.l>;il)ly rauso the section 



. i,, th,. edge <>r under- surf ace of the knife. 



icllodion i- dry, which mi^ht to be in two or 



til--. n th. ; 'ii. withdraw the knife, and pass 



er tlic newly exposed surface of the 



U'hiUt tin's hiM layer of collodion is drying, take 



in fcion from the knife nnd place it with the collodion- 



1 suri iovvn wards '.n a slide prepared with fixative of 



il.aiim. Tlicn mt the second <cction, and repeat the 



nipulat .'"ii< ju-t di-scnlu'd in the same order." 



H M /'/.-.. iii. LSSi). p. ITS) takes instead of collodion 



'Inti.'ii \' jxiritiiiii in absolute alcohol. 



r e\tn-mc]y brittle objects. such as ova of Phalangida, he recom- 

 ni'-ii'U a thin li-ht vll'.u i solution of *]t<'ll<ir in absolute alcohol. 



Ill ii'ia: i /:////////",/,,/,,////-. r. Ifiiilr.ijihilu*. 1ssj>. p. ]2; cf. Zeit. wiss. 



': . \iii, I^'.'J. p. '":'. employs a solution made by mixing a solution of 



in .-tlit-r. of a syrupy consistency, with an equal volume of 



"ii. and dilutinn' tin- mixture with ethor until quite thin and 



liquid. 



. l^'l. p. 17") employs tiiji.-rli-iitnl jmraffin (of about 



Tin- lia> tli.- advantage of filling up any cavities there may be 



bje.-ts. and also of y,,vro/////f/ flu- xi'i-f/'mix frcnn rolliiiy. A com- 



l"l'iii"iit of this process is described by LENDENFELD in 



V //.-.. \\iii. l!iu|. p. |x 



'.M;i;r..l,-i-h,,;k. p. ]s.!) employs a 1 per cent, solution of 



tl|(l sections to mil. and unrolls them by the water- 



pi-.. . I 



i/ /r.) ad. Is :, drops of oil of cedar to 15 c.c. of the 

 Intion of i-elloidin. and finds that rolling j s prevented. 



Ribbon Section-cutting.- -If a scries of paraffin sections 



'"' rllt '" succession and not removed from the knife one by 



it, Inn allow,, 1 to hV undisturbed on the blade, it 



quently happens that they adhere to one another 



'" f orm a chain or ribbon which may be 



transferred to a slide without breaking up 



fhtening the labour of mounting a L-ies' 



1(11 "'' :1 nbbon, the paraffin must be of a 



having the righl relation to the temperature of 



condly,the knife should be set 

 ' illnlh ' ""' blo <* of paraffin should be trimmed so 

 ' ! " ! " :i ^raightedge parallel to the knife edgej and' 



