APPENDIX. 205 
APPENDIX. 
I. 
The following tables may be useful if stains, &c., 
have to be prepared when the metric weights and mea- 
sures are not at hand. The equivalents given are not 
absolutely accurate, but are sufficiently near for most 
purposes. 
1 Litre. i 352 fluid ounces. 
too C.C. : 3% fluid ounces, 
1 Gramme ‘ 15°43 grains. 
1 Fluid ounce . 28°4 C.c. 
1 Fluid drachm 3°5 C.C. 
1 Grain. : ‘064 gramme. 
To convert grammes per litre into grains per ounce 
multiply by the factor 4. Thus 10 grammes per litre - 
= 10 X 7 = 4'4 grains per ounce. 
To convert cubic centimetres per litre into minims 
per ounce multiply by the factor 42. Thus 25 c.c. per 
litre = 25 x 32 = 12 minims per ounce. (A close 
approximation is given by multiplying by 4. 
To convert degrees Centigrade into degrees Fahren- 
heit multiply by the factor 2 and add 32. 
II. 
NEISSER’S METHOD OF STAINING THE DIPHTHERIA 
BaAcILLus. 
The following method has been placed in the Appen- 
dix as there is some doubt as to its value. It isa 
