2600 



Journal of Applied Microscopy 



pole is more easily handled and, second, its blood corpuscles are large and the 

 capillaries are correspondingly large. The method of anesthetizing tadpoles 

 and of mounting them for the projection of the circulation of the blood with a 

 projection lens such as is used with lantern slides will be found in Art. XIV 

 (May, 1903) of this series. 



For projection with one-quarter to one-inch microscopic objectives, the anes- 

 thetized tadpole is mounted in a life cage (Fig. 9, No. 14), care being taken to 

 have as much as possible of the animal's tail in contact with the inside of the 

 front of the cage so as to be within the working distance of the higher power 

 objectives mentioned above. Focus on the thinner parts of the tail for the capil- 

 laries, and on the thicker portion for arterial and venous trunks. 



A. H. Cole. 



The Museum. 

 XII. 



ACCESSORIES AND LABELS, ETC., ETC. 



Besides the cases which form the larger receptacles for objects, the museum 

 curator is compelled to consider various instrumentalities for arranging his speci- 

 mens both in and outside of the cases, besides the very trying questions of 

 the security, the curing and storage of specimens. 



DRAWERS. 



There is a need in every museum of drawers, and with them some sort of 

 interchangeable system. Drawers under the flat cases of an exhibition hall are 



very convenient, and readily permit of the storage 

 of overflow specimens, of specimens less well 

 adapted for exhibition, and of the interchange of 

 specimens exhibited, with others which are suit- 

 able for exhibition, but which cannot, for lack 

 of room, be all exhibited at once. Such drawers 

 should be accommodated to a system of runways 

 or slides stepped up into stacks (Fig. 83), and 

 the unit drawer being fixed its depth should be 

 equal to, or a multiple of the height of the run- 

 ways so that the top of the drawer will be on a 

 level with the next succeeding runway. Every 

 other drawer in a stack can always be varied in 

 depth so as to be a multiple of the depth of the 

 unit drawer, or indeed any multiple of the height 

 of the runways. 



The dimensions of the unit drawer, as de- 

 signed in the National Museum, is 24 by 30 

 Fig. 83.— Drawer Runways. inches. Indifferent departments, however, and 



