(1695) down , as in Fig .6 , GHIE , one sees the horny part of the sting , by which it is partly pushed out and keeps its rigidity or firmness for stinging .Now I have previously set forth my thoughts about the use of these stings in stinging and at what time they use it , but why it is only the males and not the females that are furnished therewith , that is a matter at which I have indeed made some guesses , but I have not been able to find out the true reason of it .