468 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



words, the working of large stoves is more economical. The authors 

 are quite clear as to the overwhelming advantages of electric stoves, 

 but admit that the cost of electricity must in many cases be a difficulty. 



Fig. 73. 



Review of Previous Works. This includes a bibliography in chrono- 

 logical order. 



B. Technique.* 

 (1) {Collecting 1 Objects, including- Culture J Processes. 



Apparatus for the Continuous Agitation of Cultures.! — E. Bodin 

 and E. Cartex describe such an apparatus which they have found 

 especially useful in obtaining homogeneous cultures of the tubercle 

 bacillus. 



It consists of a platform a, on which rest the tubes to be shaken. 

 This platform is able to turn on a horizontal axis b 5, and receives an 

 alternating movement by means of a small roller c, rolling on an 

 elliptical and eccentric cam d, connected by a shaft e, with a pulley /. 

 The axis of rotation of the platform is constituted by two pegs of wood 

 fixed to it opposite one another. These turn in two supports g g, fixed to 

 the table h. Between the platform and the supports are two washers 

 i i. The roller made of wood or of metal, and surrounded with india- 

 rubber, turns between two pieces of copper, //, 1 mm. thick. The shaft 

 of the cam is a tube of copper or brass, 8 mm. in diameter and 1 mm. 

 thick. The cam is fixed to the shaft by means of a pin. The shaft 

 turns in two wooden supports, k k, the holes of which are lined with 

 pieces of copper tubing, I D, of sufficient diameter to admit the shaft. 

 Just outside the supports two pieces of the same copper tubing, 

 m wAD, are fixed to the shaft to limit lateral movement. The 



* This subdivision contains (1) Collecting Objects, including Culture Pro- 

 cesses; (2) Preparing Objects ; (3) Cutting, including Imbedding and Microtomes ; 

 (4) Staining and Injecting ; (5) Mounting, including slides, preservative fluids, &c. ; 

 (6) Miscellaneous. 



t Ann. Inst. Pasteur, xviii. (1904) pp. 264-6. 



