What do scientific men understand by reason

John Alex Ollard, « Caddis-Worms Cases-Intelligence in animal », Knowledge a monthly record of sciences, Vol 1, avril 21, Londres, Knowledge Publishing Co., 1882, p. 538.

( 385) -I notice caddis-worms use, among other things, little pieces of plants. I further notice, so long as the caddis has need of them so long do they keep their life and original colour. How does the worm keep them alive ?
What do scientific men understand by reason ? A good definition wanted. Why divided into positive and abstract ? What acts in man are the result of reasoning powers ? Is reasoning power necessary for man to perform the acts of daily lifo ? Would the acts performed by animals, if performed by men, be considered to require reasoning powers ?