WITH THE MICROSCOPE. 22Q 



PART IV. 



ON TAKING PHOTOGRAPHS OF MICROSCOPIC OBJECTS. APPARATUS. 

 ILLUMINATION. CHEMICAL SOLUTIONS. PRACTICAL MANIPU- 

 LATION. PRINTING. PHOTOGRAPHS FOR THE MAGIC LANTERN. 



SINCE the last edition of this work was published in August, 1864, 

 some valuable improvements have been introduced in the method 

 of taking microscopical photographs, and it seems probable that 

 before very long far greater perfection in the results will be obtained 

 than was supposed to be possible at that time. My friend, Dr. 

 Maddox, has continued his experimental investigations and with 

 continually increasing success ; and many observers in Germany and 

 France, as well as in this country, have produced beautiful pho- 

 tographs of various kinds of objects. But perhaps the most remark- 

 able advances have been made in America. The authorities in the 

 War Department recognising at once the high importance of photo- 

 graphic representations of microscopical specimens have issued a 

 report in which will be found the results of the researches of 

 Brevet Lieut-Colonel Dr. J. J. Woodward and Brevet Major Dr. F. 

 Curtis, This report is most admirable. The drawings are beau- 

 tifully executed, the paper well adapted for them, and the printing 

 excellent, contrasting remarkably in all these points with the rough 

 looking blue books issued under the authority of our Govern- 

 ment. 



It seems to me very hard that our statesmen do not more dis- 

 tinctly indicate that they fully appreciate the high importance of 

 purely scientific investigation than has been the custom hitherto, and 

 our Government clearly ought to take a very active part in advancing 

 new methods of enquiry, particularly in connection with naval and 

 military medicine and surgery. In the medical department of our 

 army and navy there are to my knowledge scientific men as able 

 and as willing to devote themselves to scientific work as any in the 

 world, but they have no opportunity, and little or no encouragement 

 seems to be afforded by the high military authorities. I append an 

 extract from p. 149, Circular No. 6, Nov. 1865, War Department, 

 Surgeon-General's Office, Washington, and hope that it may perchance 



