OWN A MOTOR? 
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write for our price on a new 
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BUILDING AN AERO? 
Radiators for Aeroplanes and 
dirigibles carried in stock or 
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We repair and re-tube radiators. 
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JOHN DAVEY 
FATHER 
TREE SURGERY e j 
Give the trees a chance to live in health {J 
f and beauty. If they die because you fail 
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The saving of trees is the business and 
the profession of the Davey Tree Experts. 
# John Davey, Father of Tree Surgery, is 
f their teacher and their guarantor. 
A Beautiful Free Booklet 
will be sent you if you have a number 
A of trees, either shade or fruit. How many 
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located? Tell us this when writing. | 
Our men are working in the South 
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The Davey Tree Expert Co., Inc. 
121 Ash Street 
KENT, OHIO 
@ A very interesting pamphlet just issued by us on the Pergola, can 
be had free on request. Ask for Catalogue A-27. 
Hartmann-Sanders Co. 
(goes 
Elston and Webster Avenues - CHICAGO, ILLINOIS 
Eastern Office: 1123 Broadway, NEW YORK CITY 
29° 0} 
Exclusive Manufacturers of 
Koll’s Patent 
Lock Joint 
Columns 
Luv 
@ Suitable for Pergolas, 
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<a HARTMANN-SANDERS COMPANY 
@ We also publish Catalogues A-29 of SUN DIALS and A-40 
of WOOD COLUMNS. 
AMERICAN HOMES AND GARDENS 
ENGINEERING CONSTRUCTION IN STEEL AND 
Timser. By William Henry Warren. 
London and New York: Longmans, 
Green & Company, 1910. 8vo.; 472 
pp. Price, $5. 
The development in the science of test- 
ing materials, and the various researches 
undertaken during the last fifteen years, 
have supplied an enormous amount of data 
on the physical properties of the materials 
of construction. Wrought iron has been 
replaced by structural steel. The safe in- 
tensity of working stresses in structures 
subjected to moving train loads is now con- 
sidered to be best determined by means of 
an equivalent dead load, equal to the live 
load increased by an amount representing 
the impact effect, added to the dead load, 
in preference to the so-called fatigue 
formule for working stresses. It has there- 
fore necessitated rewriting the first two 
chapters of the book. A cursory examina- 
tion gives the idea that it is a thoroughly 
valuable treatise which will be of the 
greatest assistance to engineers, particularly 
for the design of roofs, bridges, viaducts, 
beams, columns, etc. The book is very well 
made and has a number of excellent fold- 
ing plates. 
THE Boy Aviators IN NICARAGUA. By 
Captain Wilbur Lawton. New York: 
Hurst & Co., 1910. 12mo.; 336 pp. 
Price, 35 cents. 
This book is nothing if not up-to-date. 
It takes up a most exciting story of a most 
impossi‘le nature, in which two boys who 
have built an aeroplane become involved in 
the revolution of Nicaragua. Their excit- 
ing adventures with a general of the Nic- 
araguan forces who is bent on their de- 
struction, and also that of a newspaper cor- 
respondent, should give boy readers many 
a thrill. 
SICILY, THE GARDEN OF THE MEDITER- 
RANEAN. By Will S. Monroe. Bos- 
ton: .L. ©. Page & Go:, 1909. 12mo:; 
405 pp. Price, $3. 
The author deals in an interesting way 
with the history, people, institutions, and 
geography of the island. The aim of the 
author has been to interest the general 
reader of travel and description, to inform 
prospective tourists to the Garden of the 
Mediterranean, and to refresh the memories 
of those who may have already made the 
tour. In this, as in his other books of 
travel, the author has placed special em- 
phasis on the distinctly human side of the 
subject, and, while not including the dis- 
covery of the island and its diverse physical 
features, it has been, after all, the Sicilians 
themselves—their manners, customs, habi- 
tations, and institutions—that have re- 
ceived the lion’s share of the book. 
SELF-TAUGHT MECHANICAL DRAWING AND 
ELEMENTARY MACHINE DEsIGN. By 
F. L. Sylvester, M. E. With addi- 
tions by Erik Obero, Associate Edi- 
tor of Machinery. New York: The 
Norman W. Henley Publishing Com- 
pany, 1910. 12mo.; 230 pp. Price, $2. 
This treatise conveys the first principles 
of geometric and mechanical drawings, 
workshop mathematics, mechanics, strength 
of materials, and the calculations and design 
of machine details, including cams, sprock- 
ets, gearing, rivets, bolts, belting, couplings, 
screws, pulleys, clutches, flywheels, etc. 
The book is well made, but a criticism 
which will be quickly made on it is that it 
devotes more attention to elementary ma- 
chine design than it does to mechanical 
drawing. Perhaps if the title had been re- 
versed, the true contents would be disclosed 
more accurately, 
January, 1911 
CGregory’s Honest 
FLOWER SEED OFFER 
We will send you these ten packages of Gregory’s Honest 
Flower Seeds, postpaid, for 25 cents in coin. 
90 cents worth for 25 cents 
1 pkg. Aster, Gregory’s Special Fancy Mixture, . . . 10c. 
1 pkg. Pansy, Gregory’s SpecialFancy Mixture, . ° . 15c. 
1 pkg. Coreopsis, Gregory’s Special Fancy Mixture, ° 4 05c. 
1 pkg. Poppy, Gregory’s Fancy Double Mixed Annuals, 5 10c. 
1 pkg. Mignonette, Gregory’s Large Flowering, very rich, . 1@c. 
1 pkg. Bachelor Button, Gregory’s Finest Mixture, . e 10c. 
1 pkg. Petunia, Gregory’s Finest Hybrid Mixture, . 3 15c. 
1 pkg. Candytuft, Gregory’s Finest Mixed, 5 5 ° > 5c. 
1 pkg. Nasturtium, Dwarf, Finest Mixed, . . 5 5 5 05c. 
1 pkg. Sweet Peas, Extra Choice Mixed, . . 
10 packages sent for 25¢ in coin. Our 
new 1911 Catalogue, more proteeyy 
illustrated than ever, is just out. 
copy to you for the asking. 
J. J. H. GREGORY & SON, 
42 Elim St., Marblehead, Mass. 
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Wall Coverings 
A PRACTICAL HANDBOOK 
for Decorators, Paperhangers, Archi- 
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with many half-tone and other illus- 
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By ARTHUR SEYMOUR JENNINGS 
EXTRACT FROM PREFACE 
HE author has endeavored to include 
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One Large 8vo Volume, Cloth. $2 
MUNN & CO., 361 Broadway, NEW YORK 
