ON INSTRUMENTS AND THEIE USE. 37 



THE CONVEESION OF FEENCH INTO ENGLISH 



WEIGHT. 



Although a gramme is equal to 15-4346 grains, the decimal 

 is one which can never be used in microscopy ; hence in the 

 following table it is assumed to be 15f grains, which is the 

 nearest approach that can be made to practical accuracy : 

 Grammes. 



1 = 15f grains. 



2 - 30* 



3 = 46i ,, 



4 = 6 If ,, or 1 drachm If grain. 



5 = 77 ,,,,1 17 grains. 



6 = 92f 1 32f 



7 = 107J 1 47* 



8 = 1231 2 drachms 3 



9 138f 2 18f 



10 = 154 2 34 



11 = 169f 2 49f 



12 = 184f 3 4* 



13 = 2001 3 20i 



14 = 215f 3 35f 



15 = 231 3 51 



16 = 246f 4 6| 



17 = 261 4 21 



18 = 277i 4 371 



19 = 292f 4 52f 



20 = 308 ,,5 8 

 30 = 462 7 42 

 40 = 616 ,,10 16 

 50 - 770 ,,12* 50 

 60 - 924 ,,15 24 

 70 = 1078 ,,17 58 

 80 = 1232 ,,20 32 

 90 = 1386 ,,23 6 



100 = 1540 ,,25 40 



