Sentence:  The Entomologist has every reason to be thankful that, early last spring, he laid in a supply of arsenate of lead, Black Leaf No. 40, commercial lime-sulphur, tree <WSD>tanglefoot</WSD>, tobacco dust, also providing himself with an abundance of air-slaked lime and a spraying outfit suitable for use in a small experiment garden and orchard at Lake Minnetonka. 
Meaning of the word marked with <WSD> tags:  A sticky substance put at the base of trees or other plants to trap insects and prevent them from climbing up.