The adoption, in 1902, of the caduceus for US Army medical officer uniforms popularized the use of the symbol throughout the medical field in the United States. Rod of Asclepius It is relatively common, especially in the United States, to find the caduceus, with its two snakes and wings, used as a symbol of medicine instead of the Rod of Asclepius, with only a single snake.
In order to combine JPEGs into PDF file, you need to locate them together. Total Image Converter supports batch conversion only for images in one folder. Select them as sources for conversion and click on the icon with the desired format. The popup wizard will give you the ability to set parameters for conversion.
If you have a pdf with scanned images, you can use convert to create a pdf with jpeg compression (You can use this method on any pdf, but you'll loose all text informations). For example: convert -density 200x200 -quality 60 -compress jpeg input.pdf output.pdf. Adjust density (e.g. 100x100) and quality to your needs.