214 



BACTERIOLOGY. 



all secured by the turn of the single set-screw. Of 

 course, the extremities of the animal are to be secured. 

 This is done by means of cords securely held by a 

 patent fastener made by the Tie Co., of Unadilla, N. Y. 

 These fasteners are in every way more convenient than 

 the elects in common use. An idea of the apparatus is 

 given in Fig. 41. 



FIG. 41. 



A very simple and useful holder for guinea-pigs con- 

 sists of a metal cylinder of about 5 cm. diameter and 

 about 13 cm. long, closed at one end by a perforated 

 cap of either tin or wire netting. Along the side of 

 this box is a longitudinal slit 12 mm. wide that runs for 

 9.5 cm. from within 0.5 cm. of the open extremity of 



