670 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



lever F is flanged (F&) so as to fit into U. The between-space is filled 

 with oil, which finds its way to the rotatory bolt T through perforations 

 in the wall of the box Fb. The connexion of the micrometer screw S 

 with the rotatory bolt T is effected by means of the hardened steel 

 conical wedge Z. This wedge has a hemispherical base which engages 



Fig. 103. 



in a hemispherical socket in the top of the bolt T. The author con- 

 siders that this device is superior to rounding off the base of the 

 micrometer screw itself. 



(4) Staining and Injecting-. 



Modification of Bielschowsky's Silver Method.* — P. Snessarew has 

 devised the following modification of Bielschowsky's method for staining 

 connective-tissue fibres. The chief alteration consists in immersing the 

 sections in a solution of crystallized ammonium ferro-sulphuricum cryst. 

 The procedure is as follows : The tissue is fixed in 10 to 15 p.c. formalin 

 for a couple of hours ; it is then washed in running water for 30 to 40 

 minutes, after which it is sectioned by the freezing method. The 

 sections may be washed in a weak solution of formalin or be transferred 

 straight away to 2h to 10 p.c. solution of ammonium ferro-sulphuricum 

 cryst. In this solution, which must be changed at least once a day, the 

 sections remain at least four days. The solution must be kept in the 



* Anat. Anzeig., xxxvi. (1910) pp. 401-11 (7 figs.). 



