1889.] 



MICROSCOPICAL JOURNAL. 



245 



circulation in the mesentery of warm-blooded animals. This apparatus 

 is shown in Fig. 10. It consists of a stout iron stand, with a wooden 

 top 10X 19^- inches, which forms the stage. The standard of the micro- 

 scope is fitted to the frame and is held by a pin which enables one to 

 remove it when necessary. On the wooden base-plate is a section of 

 wood of the same size as the lower one. It is unattached, and can be 

 moved about as desired- To maintain an approximate equilibrium, a 

 cord and weight are attached to the front corners, the cords passing 



Fig. 10. — Thoma's Apparatus for Studying the Circulation in the Mesentery of 

 Warm-blooded Animals. 



over pullies fastened to the lower plate. The lower plate has a horse- 

 shoe opening and the upper a circular opening just below the body 

 tube of the microscope. Over the opening in the upper plate is fixed the 

 hot stage. This is a brass box 4^X2^ X 1 inches with a circular open- 

 ing for illumination, closed at the top and bottom by glass plates. Water 

 at the pr-oper temperature is conveyed into the box by the tube on the 

 left, the waste being conveyed away by the tube on the right. A small 

 cock on the right of the box allows the escape of air bubbles. The ir- 

 rigating canula is supported by rod and clamp so arranged that the 

 stream of fluid can be directed on the object. The stage having an in- 

 clination of 20 the waste fluid flows to the back of the stage and is 

 directed toward the two " sewer tubes " by the raised ledge. For heat- 

 ing the water supply to the hot-stage the apparatus described by S chafer 

 may be used. 



King's Cements. — These cements and finishes are having an ex- 

 tensive sale, and are universally acceptable because they honestly answer 

 all the purposes for which microscopical cements are needed. The red 



