90 Schmidt & Haensch, Berlin S. 



apparatus than with the corresponding colour apparatus, and the pen- 

 umbra apparatus is, therefore, more and more taking the place of the 

 colour apparatus. 



c) 1. Stammer's apparatus for testing beet root. It has 

 the same optical construction as the penumbra apparatus c. Its scale 

 is, however, limited to a range from to 85. AVith two observation 

 tubes of 200 mm length. 



2. The same apparatus for tubes of 400 mm length, with 

 2 tubes 400 mm long, in case. 



f) Apparatus, original construction, 



Fig. 30. 



similar to e, for urine sugar and albumen tests, reading to 

 0,1%, with one observation tube of 200, 100 and 50 mm respectively. 

 In mahogany case. (Fig. 30.) 



The instruments enumerated under a, b, c and d are now only fitted 

 with nickelin scales, and a reflecting illuminator is recommended for convenient 

 reading. 



