254 



Presents, 



[Feb. 6, 



necessary that the equilibrium be maintained during a long time 

 within very narrow limits of temperature, in order that the quick- 

 silver of the thermometer and the glass of the bulb may completely 

 attain the temperature of the liquid (for this the velocity with which 

 this takes place was measured), in order that the atmospheric pressure 

 and the inner pressure of the mercury column may completely exert 

 their influence on the read freezing temperature. It was found in the 

 limits of 250 mm. that if the increase of the outer pressure against 

 the inner be 0*96 mm., a rising of the read freezing point by 000031° 

 corresponds, and that the velocity with which the inner and outer 

 pressures completely exert their influence is about two minutes 

 in duration. (3.) Great precautions must be taken to bring the mer- 

 cury thread to its maximum, and this must be controlled. (4.) Care 

 must be taken for " dead " points, that no vacuum is formed in the 

 mercury bulbs, and for this a certain kind of tapping of the thermc- 

 meter cork must be used, the mercury must not be allowed to rise, 

 while a series of experiments is being carried out, into the upper 

 reservoir, &c. 



Presents, February 6, 1896. 



Transactions. 



Batavia : — Koninkl. Natuurkundige Vereenigiug in Nederlandsch- 



Indie. Natuurkundig Tijdschrif t. Deel L1II. 8vo. Batavia 



1893. The Society. 



Berlin: — Gesellschaft fur Erdkunde. Verhandlungen. Bd. XXII. 



No. 10. 8vo. Berlin 1895. The Society. 



Bhavnagar : — Archaeological Department. A Collection of Prakrit 



and Sanskrit Inscriptions. 4to. Bhavnagar . 



H. H. The Maharaja of Bhavnagar. 

 Boston : — Boston Society of Natural History. Memoirs. Vol. V. 



Nos. 1—2. 4to. Boston 1895 ; Proceedings. Yol. XXVI. 



Part 4. 8vo. Boston 1895. The Society. 



Chicago: — Field Columbian Museum. Publications. Nos. 2 — 4. 



8vo. Chicago 1895. The Museum. 



Cracow : — Academie des Sciences. Bulletin International. De- 



cembre, 1895. 8vo. Gracovie. The Academy. 



Halifax, N.S. :■ — Nova Scotian Institute of Science. Proceedings 



and Transactions. Yol. VII L Part 4. 8vo. Halifax, N.S. 



1895. The Institute. 



Liverpool : — Geological Society. Proceedings. Yol. VII. Part 3. 



8vo. Liverpool 1895. The Society. 



London : — British Astronomical Association. Journal. Vol. VI. 



No. 3. 8vo. London 1896. The Association. 



