11 



ADVERTISEMENT. 



WITH WHAT MADE? 



No phase of The Guide to Nature 

 has brought more commendatory words 

 than have our photo-macrographs; that 

 is small objects like a fly's wing, the 

 stamens of plants, etc., photographed 

 under moderate magnification. It is but 

 justice to the C. P. Goerz American 

 Optical Company to state that all of these 

 have been made with their exquisite 

 gems — a three-inch and a five inch Celor. 

 Several scientific friends and even a 

 member of the Goerz office staff have 

 expressed surprise that we use the Celor 

 and not the Dagor for this scientific 

 work. The Celor has been preferred 

 because it better lights the ground glass 

 and, of course, has the same depths when 

 stopped down to same apertures as the 

 Dagor. These little lenses are used in 

 a 6 l / 2 by 8y 2 premo of forty-eight inches 

 in length, front and back focus, with 

 about a foot more of cone extension in 

 front of the bellows. The apparatus was 

 pictured on page 21 of our first number 

 (April, 1908). Nothing short of an 

 absolutely perfect lens will produce 

 good lighting, flat field and sharp de- 

 finition in such use. The Celors have 

 been a delight. Nothing has come into 

 my laboratory that does the work so 

 well. 



JUST THE THING TO SAVE THE PLANTS. 



Any one desiring to procure an excel- 

 lent hand plant sprayer to spray the 

 leaves upon indoor plants, to keep the 

 insects off and otherwise keep them 



healthful, should send $1.00 to The G. N. 

 Lenox Sprayer Company, 165 West 

 Twenty-third Street, New York City, 

 and receive one by return mail. This 

 sprayer will spray under and over the 

 leaves. Three cakes of tobacco soap to 

 make a spray solution will be included. 



REMARKABLE BONORA. 



Our readers know from former exten- 

 sive advertising in The Guide to Na- 

 ture of the extended experience with 

 nutritive plant tablets. Those are good 

 for scientific experiment, but for plants 

 in pots and general use with plants in 

 the "window garden" or in the green- 

 house Bonora is far better. If we 

 were to write pages regarding this 

 wonderful plant invigorator we could 

 not say more. 



There was a full account of this 

 plant food in the November number 

 of The Guide to Nature. Bonora is 

 universally praised by those who have 

 used it. These users include leading 

 growers of plants such as The Conard 

 & Jones Company, John Lewis Childs, 

 Luther Burbank, Eben Rexford and 

 others. See the advertisement on the 

 second cover page of this issue. Send 

 for Bonora, make your plants thrive 

 and be happy. 



Nature and Science 

 FOR YOUNG FOLKS 



(A Department of 

 The St. Nicholas Magazine 



PUBLISHED BY 



THE CENTURY COMPANY 



New York City) 



Edited by 



EDWARD F. BIGELOW 



The publishers in their announcements 

 for 1909 refer to Nature and Science as 

 "that delightful and helpful department" 

 and state that it "promises more interest 

 and profit than ever." 



"Nature and Science has won its pre- 

 sent high standing by accuracy in por- 

 traying nature from the standpoint of 

 the child. The editor has secured the 

 co-operation of nearly all the best natural- 

 ists, scientists and nature artists in the 

 country. The text and illustrations are 

 directly from nature — not from books — 

 and are absolutely true. So carefully 

 is every statement weighed, questioned, 

 and criticized, that every parent, every 

 teacher, every child has imDlicit confi- 

 dence that a statement in Nature and 

 Science can be absolutely relied on. And 

 it's interesting." 



