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PUBLISHERS NOTICES 



Tis not in mortals to COMMAND success, but we'll do 

 more, Sempronius, we'll DESERVE IT. — Addison: Cato. 



When You Go to New York. 



Do not forget that the Hotel Cum- 

 berland, at Broadway and Fifty-fourth 

 Street, is ideal in location and equip- 

 ment. Every convenience is provided 

 for guests. The rates are reasonable. 

 Try this hotel and see for yourself. 



For Household Aquaria. 



There is no more beautiful ornament 

 for the household, and nothing more 

 interesting in the study of nature, than 

 a well "balanced" aquarium. Those in 

 the Arcadia laboratory that are the 

 most successful were supplied by Jacob 

 C. Cassel, 915 Arch Street, Philadel- 

 phia, Pennsylvania. Write him for full 

 particulars. Get the tank with slate 

 bottom. He has nice ones with brass 

 frames nickel plated. 



The Remarkable Goerz Lenses. 



It is but justice to our nature stu- 

 dents to state that most of the best 

 "home work" in photography by this 

 magazine is done with the Goerz lenses. 

 Occasionally some others are used for 

 certain conveniences or some special 

 purpose, but such master work as the 

 frontispiece of the last number and of 

 this and most of the other carefully 

 detailed work have been made with 

 Goerz Celor lenses. 



The Dagor is probably in more ex- 

 tensive use among photographers, but 

 for the nature work within the scope 

 of this magazine, the Celor has been 

 found most efficient. 



The work in photo-macrography has 

 been done wholly with two small Cel- 

 ors — a three-inch and five-inch. 



You have all heard the mythical 

 story of the man who in building a 

 house made two cat holes — one large 

 and one small. A passerby inquired 



why the two holes. The indignant re- 

 ply was, "How in thunder do you think 

 that big cat can go through that little 

 hole? I must have a hole for the big 

 cat." 



"But," was the retort, "Cannot the 

 little cat go through the big hole? 



(This story is told of Sir Isaac New- 

 ton who cut the two holes in his study 

 door, one for the old cat, the other for 

 the kitten.) 



"Oh ! I never thought of that." 



So it seems to me that those na- 

 ture students who advocate the Dagor 

 (smaller aperture) for "all round work" 

 in science have forgotten that the lesser 

 lighting of the Dagor can go through 

 a Celor with its big aperture. But the 

 speed of the Celor cannot be had from 

 a Dagor. The lenses stopped down 

 equally are supposed theoretically to 

 be of equal depth. But in actual ex- 

 perience, I get greater depth with the 

 Celor. 



I do not mean to propound a new 

 theory in optics. Perhaps I am at 

 fault ; perhaps the merit is in the 

 Celor. I do not know. I merely state 

 what I get in my own experience. 



Let us have a little talk about lenses. 

 Show what you get and tell us how 

 you get it. 



Anguish of mind has driven thous- 

 ands to suicide; anguish of body, none. 

 This proves that the health of the mind, 

 is of far more consequence to our hap- 

 piness than the health of the body, al- 

 though both are deserving of much 

 more attention than either receives. — 

 Colton. 



'Tis a fine thing to smart for one's 

 duty ; even in the pangs of it there is 

 contentment. — R. L. Stevenson. 



