Monthly Mlcroscoplcftll / qOQ \ 
Journal, May 1, 1869. J V ) 
COEKESPONDENCE. 
Woodwabd's Heliostat. 
To the Editor of the ^Monthly Microscopical Journal.^ 
Washington, D.C., March 13, 1869. 
Dear Sir, — In the January number of your Journal, page 29, is 
a short description of a cheap Heliostat for use in making photo- 
micrographs, which is erroneously ascribed to me. I sent the account 
of it to Dr. Maddox, in May, 1868, with the request that he would 
publish it if he thought it of sufficient importance. I expressly stated 
in my letter that the instrument was devised by my friend and 
assistant, Dr. Edward Curtis, but Dr. Maddox seems inadvertently 
to have overlooked this passage. 
The facts are, that this cheap Heliostat was originally planned by 
Mr. Lewis Rutherford, of New York, and the modifications described 
in the January number of your Journal were devised by Dr. Curtis, 
who drew up the description there published. I regret this misunder- 
standing the more, as in your February number, page 131, the instru- 
ment is also ascribed to me by Mr. Higgins. I sent him plans of the 
instrument in answer to an inquiry, making, however, no claims to 
its invention. 
Will you kindly publish this note in your next number ? 
Very respectfully, your obedient servant, 
(Signed) J. Woodward, 
Assist. Surgeon and Bat. Lt.-Col. 
Note. — We are also informed by Dr. Maddox, that the Photomicrographio 
Apparatus, figured in the Appendix of Dr. Beale's 'How to Work with the 
iDlicroscope,' Plate Ixix., 4th edition, and ascribed by him to Dr. Woodward, was 
devised by Dr. Ed. Curtis. 
