QUARTERLY CHRONICLE OF MICROSCOPICAL 



SCIENCE. 



HISTOLOGY.' 



1. Technical Methods. — I. A newHot-stage. — Panum(*Nord. 

 Medic. Arkiv.,' viii) iiiids that in the hot-stages for micro- 

 scopical observation now in use it is impossible to determine 

 with accuracy the temperature of the object under ob- 

 servation, and there is the further inconvenience of con- 

 densation of water on the object. To remedy these defects 

 he has constructed a hot chamber of tin plate, which sur- 

 rounds the lower part of the microscope as well as the stage, 

 light being admitted to the mirror through a movable pane 

 of glass in front. The sides and back of the chamber are 

 double, and thus form a large vessel containing water, which 

 can be easily heated- The roof is perforated to allow the 

 tube of the microscope to pass through, and also to admit a 

 small thermometer, the bulb of which is placed near the 

 object-glass. The object is introduced or manipulated 

 through openings in the sides of the chamber, which can be 

 closed Avith corks. The circulation of water enclosed in the 

 walls of the chamber maintains a very uniform temperature ; 

 so large is the mass of heated material that the existence of 

 small openings has little effect on the temperature of the 

 air inside, nor is this materially affected even by opening the 

 side or front windows. 



2. On the use of Chloral Hydrate in Histology. — Andre 

 Journ. de I'Anat. et de la Physiol.,' Jan., 18T4) recommends 

 the use of this reagent for the study of the retina. With a 

 solution of 4 grms. chloral in 30 grms. water (sometimes 

 with the addition of 16 grms. glycerine), the fibres of 



1 The articles in this division are arranged under the following heads : — 

 I. Text-books and Technical Methods. II. The Cell in General. III. Blood. 

 IV. Epithelinra. V. The Connective Tissues. VI. Muscle. VII. Nervous 

 System. VIII. Organs of Sense. IX. Vascular System. X. Digestive 

 and Respiratory Organs and Glands. XI. Skin and Hair. XII. Urinary 

 and Sexual Ajiparatus. 



Tiie Editors will be glad to receive, for the purpose of making this 

 record more complete, copies of separate memoirs or reprints from pe- 

 riodicals, which must otherwise often escape notice. We have to acknow- 

 ledge the assistance of Dr. Cavafy in making these abstracts. 



VOL. XIV. NEW SER. D ^ 



