1889.] 



MICROSCOPICAL JOURNAL. 



245 



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

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

 top loX 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 bodv 

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

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

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

 at the proper temperature is conveyed into the box by the tube on the 

 left, the waste being conveyed awav 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 Schafer 

 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 



