in the fluid; this was not further investigated. Small amount of 
some copper-reducing substance seems to be present in the solu- 
tion. This may be a sugar, but its amount is very small indeed and 
no osazone could be obtained from it. 
Careful search was made for the presence of digestive enzymes, 
but none were found. Proteolytic enzymes cannot be present in it, 
for if such were the case auto-digestion of the proteins present in 
it must necessarily occur, yielding propeptones, etc., and we have 
already seen that these are absent. But if this fluid is derived from 
the salivary glands as has been suggested, diastatic ferments ought 
to be present in it, as these beetles are phytophagous. Neverthe- 
less when a 2.5 %. solution of soluble starch is mixed with 1/5 of 
its bulk of the secretion and placed in a thermostat at 20°C. 
gradually raised to 35° for 30 minutes, no reducing sugar is obtained, 
and therefore probably no enzyme is presentiin the original fluid. 
No further investigation could be pursued owing to the supply 
of secretion having completely failed. 
