The first series of photographs thrown on the screen included the different parts of the human skeleton. The second series illustrated photographs of the soft tissues, such as the tongue, larynx, heart, and diaphragm, all from the living subject. The third series were taken with a view to reduction of the time in exposure. With the fourth is given a description of some experiments upon attempts to polarise the x-rays.

The apparatus now most commonly employed was used in these experiments, viz., electricity (from the main), an induction coil giving a range of from 2 to 10 inch spark as required, a Crooke's tube having an aluminium cathodal disc, and a small plate of platinum for the positive pole. It is now known as the focus tube. Paget xxxxx-plates were used, as no particular advantage had been obtained from those specially prepared. The following points, amongst others, were found to be of great service in obtaining the best results:—Firstly, the current passing to the coil should be regulated according to the work to be done, and as little variation as possible should take place during the exposure. Primary batteries are not as satisfactory on account of this, and the best source is from the main. Lord Kelvin's cell tester and ampere gauge were used in the experiments, and any variations in the current were regulated by means of a rheostat. Secondly, the Apps or other coil or transformer must give, with the present form of tube, six inches or even more of spark when the deeper tissues of the body, such as the spine, are being taken. Thirdly, the vacuum of the tube should be carefully regulated and tested to give the maximum results.