Faex

"In some cases he has identified the plant parasites also in the intestine of insects (Hemiptera and Muscidae) living on the plants and presumably distributing infection either by bite or by faex.[…]It gives a concise and coherent general account of the biology, the Protozoa, group by group, as exemplified by representative species and deals in well digested detail, and in their taxonomic setting, with the species found in the intestine and faex and blood and tissues of man"