In 1928 capillaroscopic studies of the alveolar capillaries were made on the anesthetized dog through a thoracotomy opening.1 In these experiments a Zeiss capillaroscope was used (fig. 1). It offered a satisfactory visualization of the alveolar capillaries through the transparent virgin visceral pleura. The details of the alveolus were not distinct, and it became obviously necessary to see the saccules in more than one dimension by means of stereoscopic visualization. An opportunity for such study has been offered by the Zeiss surface stereomicroscope with a complete double lens system. This microscope may be used with the ordinary small stand, particularly for the study of smaller blocks of tissue from the lungs (fig. 2). It may be used with a larger adjustable stand also, so that the whole lung may be studied in the living or the dry state (fig. 3).
The illumination is so adjusted that light is reflected
JOANNIDES M. STEREOMICROSCOPIC STUDY OF THE SURFACE OF THE LUNGI. DESCRIPTION OF THE METHODS USED. Arch Surg. 1938;37(1):1-6. doi:10.1001/archsurg.1938.01200010004001