500 



NEGRETTI AND ZAMBEA, HOLBORN VIADUCT, E.G. 



Each. 

 JS s. d. 



Each. 

 B. d. 



3092 Vacuum Tubes, or Laryngoscope, for illuminating the 



throat 110 



3093 Jordan's Ear Illuminator 1 10 



3094 Toynbee's set of Silver Specula, round or oval, with 



handle 110 



3095 Speculum Auris various forms 15 1 10 



3096 Warden's Auriscope 10 6 



3097 Magnifying Lenses, for examining Skin Diseases, &c., 



for the Hand or Pocket, various forms and prices 



(see pages 223 to 224). 

 3097* Steinheil's Pocket Magnifier with Apian atic Lenses 



flat field with great power each 22s. 6d., 170 250 



3098 Opthalmoscope, with Lenses complete, in pocket case, 



the improved arrangement 150 220 



3099 Liebreich's Improved Opthalmoscope, with 2 Lamp 



Chimneys, in mahogany case 5 10 



FIG. 3100. 



NEGRETTI AND ZAMBRA'S IMPROVED CLINICAL 

 THERMOMETERS. 



3100 The importance of ascertaining or watching carefully the variations of 

 temperature in disease is daily becoming more apparent. Hitherto one of the main 

 drawbacks to the general use of the thermometer by practitioners has been the fact 

 that sufficiently portable instruments have not been obtainable. This difficulty is now 

 entirely overcome in the Clinical Thermometer originally devised by Dr. Aitkin, 

 now improved by Negretti and Zambra. Each instrument is tested by a Standard 

 Thermometer, before being issued. Its portability is the great point. The 

 Thermometers are 3, 4, 5, or 6 inches in length, and can be conveniently carried in 

 the pocket: with Negretti and Zambra's improvement they are Self -Registering) 

 and may be read off at leisure. The important gain is this, that the practitioner 

 may always carry a Thermometer with an indestructible index about with him ; and 

 thus find that he has a valuable aid, not only at ordinary, but at many chance times. 

 Useful charts for daily recording the main points in physical Diagnosis have also 

 been published. For prices and descriptive details, see pages 160 and 161. 



Kew Certificate to a Clinical Thermometer, extra, 2s. 



Negretti and Zambra's Clinical Thermometers are usually divided upon their 

 stems with Fahrenheit or Centigrade scales ; if both scales are desired upon the 

 same instrument there will be an extra charge of 2s. 



