30 
than g2 per cent. of the streptococci isolated from human 
faeces give the typical reactions mentioned by Houston. Con- 
sequently we may agree with his conclusion :— 
‘« Inasmuch as salicin, as well as lactose, is really attacked 
by streptococci, it might be convenient to accept ‘lactose 
salicin microbes’ as a basis for classification purposes and of 
the streptococci fulfilling these preliminary characters to look 
with special disfavor on those which failed to attack mannite 
but clotted milk, and which also attacked both raffinose and 
ssaccharose (lamirasacsal).’’ 
