Meteorological Observations. 479 



melting it increases 5-1 per cent., so that its volume at 113° F in 

 the fluid state is 1-058. 



Rose's fusible alloy (composed of 2 parts of bismuth, 1 of lead 

 to l-00° 5 7 } e , X P a f nc K bet r en r and 138° F. in the proportion l' 

 • 7Q°.« p ! - whenfurther heated > i* contracts, so that its volume at 

 i/y br. is again equal to its volume at 32° F., and at 20*5° F 



203°° U a n ndT V F ° h T r ' * then ^^ ^ in 0n *** ^tween 

 M6 and 208 F. by 1-55 per cent., its volume at the latter temne 

 rature being \-Q\0l. -Annalen der Chemie, vol. xciii. p. 129. 



RECENT APPOINTMENTS. 



vacant' Se al oT,' S ^f ^ '° the ?"* ° f ****** ° f the Mi ^ left 

 vacant the office of Assayer to that establishment; we under 



HoJman^h ^ Sf m^ C ° mpleted by the ^minZnfSr. 

 "« man £V , 1St t0 the Museum of Practical Geology, to the vacant 

 office. We have not heard whether Dr. Hofmann pTopois to con 

 tinue his duties in Jermyn Street. While there are fo very lw stato 

 -occupations for men of science, it is scarcely desirable tl It STe be £ 

 of these should be gathered into single hands.-^ ra «£ M ay 26. 



METEOROLOGICAL OBSERVATIONS FOR APRIL 1855 



Cloudy. 10 Boisterous! ' n« i . i ■ dy and Cold : s,i S ht rain 



veryfine 13. Overcast; anghtn* 7 d Y v 7" H Ct ft*"' 

 cast 16 Foggy : cloudless'and exceedingly fine.' ft & dear 18 F^" 

 i?nd g 23 FinV 5* /°' 2L Vei - V fae = ^ hts frosty. 22.' Cold dry east rlv 



haze: fine. 28. Hazy : fine- overca t 2Q n? .f ' °r rCast - 27 - Dr y 



overcast: cloudy at night 29. Cloudy and cold. 30. Uniformly 



Mean temperature of the month i( ,o na 



Mean temperature of April 1854 1, '„ 



Mean temperature of April for the last twenty'- D ',ne' year's" '" 47 -17 

 Average amount of rain in April . J "' , : l l . , 

 Boston. — April 1. Fine 2 PlnnHv q n""j "■ 1'oD inch. 



"v^mshssiSK^ P f -* „ c,0 " d " 



hazy p.m. 3. Brigh a.m. cLr pm 4 Clear am ^ J* < B » ight ** : 

 drops p.m. G. Kai„ A . M . • c i car ^„;2 - £ '' Cloudy PM - 5 " Bri S ht AM - " 

 8, Snow-showers a.m. and™"? TSffL. ^Xt"' '^l?* ™ 8 P * 

 Rin, clear p.m. 11. Cloudy a.m. and p m ll S ?' Showers A -«- = 



13. Bright, solar halo.A.M. : rai aurora p m U 15 £££' ' C ' ear ' aUr °'' a P - M " 

 Sleet-showers a.m.- Showers pm 17 rif^' ' 15 \ n ? llt AM - = rain p.m. 16. 

 a.m.: Coudy-.M. wS,b^hti2" U Jh^^ d 2 y i, a rf^ 18 - Rai " 

 cloudy p.m. 21. Bright a.m: clear finer* 90 fl 2 °" Hai ""jhowers a.m. : 

 23. Bright a.m. : cloudy P m 24 nil., 7 S' 621 " A " M - : clear ' fille *■*• 



doudy g PM. 26 Cloudy 1m. • cle r 7m M ' 2 7 n^ i"* *\ D,m,p ** : 

 28. Bright a.m.: clear, fine a urora p m 20 n y A ^ : dear ' fi,lc '•"• 



Clear a.m. . damp p.m. 29 - Clear A - M - : clear - " lle *■»■ 30. 



Mean temperature of April for twenty-eight previous years 43°-48 

 Mean temperature of this month ... } ' A i. 



Mean temperature of April 1854 ... 44 ft 



Average quantity of rain inApril for fourteen pre viou's 'year's 1-83 inch. 



