Mandicstcr Memoirs, Vol. Iv. (191 1), No. 10. 3 



(i) Temperature, 98°C. 



Weight of acid taken =3'89 grms. 



After heating for 24 hours, weight = 2,"hS » 



» » » 46 ,, „ =3'o7 » 



'> j> )) 95 >' ') =274 „ 



)' 1) !) 118 ,, ,, =274 ,, 



» ;, •, 125 ,, ,, =274 ,, 



3*89 grms. of orthoboric acid yield 276 grms. of meta- 



boric acid. The loss of acid through volatilisation is very 



small. 



(2) Temperature, i2o°C. 



Weight of acid taken =4"22graiP. 



After heating for i hour, weight =4Tf „ 



422 grms. of orthoboric acid yield 3 00 grms. of meta acid. 

 The amount volatilised in the water vapour is somewhat 

 greater in this than in the previous experiment. This is 

 probably due to the temperature being higher and the 

 rate of dehydration being consequently faster. 



(3) Temperature, 150'C. 



Weight of acid taken ... ... =4'i4grms. 



After heating for i hour, weight =278 ,, 



J> )i )J 5 " " 2 DO ,, 



>> )) )) " >> )) ~ 2 54 )) 



)i )) )) ' 3 " " =2 47 11 



)) )) )) 29 )) 1) ""232,, 



5j J) jj 37 )) !> ~ 2 20 „ 



