The authors describe some types of capsules used in their experiences and point out the value of small intestine biopsy to the study of intestinal pathology. Six different types of capsules were tried. Hystopathological findings in 150 patients infected with different enteroparasites are described. Giardia lamblia was found in the mucosa in 16 out of 50 cases of parasitism by the protozoa; in 11.1% of the cases of schistosomiasis and 1,8% of those of strongyloidiasis parasites were seen in the mucosa. A case is described of a patient with Giardia lamblia and kala-azar; leishmanias were seen in the corion. Some other hysthological changes, considered as non specific, need more detailed studies in order to give valuable conclusions; atrophy of villi, e.g., was found in 27 cases infected by Strongyloides stercoralis, 5 of them exclusively infected by this helminth.