714 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



causes the NaOH in the tube to siphon off, and the last remaining trace 

 of oxygen is absorbed. 



r\ 



Fig. 144. 



Fig. 145. 



Egg's as a Medium for the Cultivation of Bacillus tuberculosis.* 

 M. Dorset finds that coagulated egg-albumen is an excellent medium 

 for cultivating the tubercle bacillus. The white and yolk are mixed 

 together and then distributed in tubes. The tubes are incubated at 70° C. 

 for two successive days for four hours and simultaneously sterilised. A 

 couple of drops of sterilised water are poured into each tube, and then 

 the surface of the slope is inoculated witli the tuberculous material. 

 The cotton-wool plugs are saturated with paraffin, and the ends of the 

 tubes filled in with paraffin. 



Apparatus for Removing Pieces of Tissue for Microscopical 

 Examination.f — T. L. Webb has devised an apparatus for removing 

 pieces of tissue for histological examination by means of suction. The 

 apparatus consists of a glass tube about J in. in diameter, which is 

 attached to an aspirator. When the aspirator is turned on some tissue 

 is drawn up into the tube and then it is easy to snip off a piece. 



(2) Preparing Objects. 



Simple Method of Preparing Bone Sections.! — H. G. Rosenberger 

 first cuts rough sections with a saw and then inserts them in a cavity 

 hollowed out of a piece of soft pine. The block is then held against a 

 revolving grindstone, so that wood and bone are ground down together. 

 As soon as the first side is well smoothed, the section is turned and the 



* Amer. Med., iii. (1902) pp. 555-6. See Centralbl. Bakt., l te Abt. Ref., xxxii. 

 (1902) p. 114. 



+ Journ. Brit. Dental Assoc., xxiii. (1902) pp. 438-40 (1 fig.). 

 I Journ. App. Micr., v. ri902") p. 1996. 



