APPENDIX. 
Star Photographs at Cordoba. (Letter to the Editors from Dr. 
B. A. Gouxp, dated Sept. 6, 1873.) 
Yesterpay brought me the July number of the American Jour- 
nal of Science, in whic saw with surprise an article which at 
first seemed to require comment from me. On re ection, how- 
ever, I think it better simply to state the facts of the case and 
ask you to publish them. 
You are aware of my efforts to obtain by subscription the 
means for securing an extended series of hotographs of southern 
star clusters, and also that these efforts had not the success which I 
esired. But my parents, by blood and marriage, sympathizing 
left home, had kindly offered his assistance in engaging a photo- 
graphic operator, and giving him the needful instructions for the 
telescopic work, now engaged one in New York, and caused him 
to be carefully instructed by his own assistant, Mr. Chapman 
ffi 
making photog 
hot be inconsistent with the regular work of the Observatory. 
© person engaged was the author of the paper referred to, Dr. 
¢. Schultz-Sellack, who had received a scientific education in his 
native country, and gladly availed himself of this opportunity for 
devoting himself to scientific avocations. An engagement Nom 
he 
, sympathizing with my disap- 
Ment, and with the large outlays fruitlessly made, desired to 
