218 



BACTERIOLOGY 



and 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 cleats in common 

 use. An idea of the apparatus is given in Fig. 41. 



Fig. 41 



A very simple and useful holder for guinea-pigs consists 

 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 the cylinder. The animal is placed 



