September, 1913 



AMERICAN HOMES AND GARDENS 



XV 



Out With The Birds. By Hamilton M. 

 Laing. New York: Outing Publishing 

 Company: 1913. Cloth. 8vo. Illus- 

 trated. 249 pages. Price $1.50 net. 

 "Out With The Birds" is a book that 

 would have been impossible twenty years 

 ago. The author goes armed, but not with 

 a gun. He brings home his game at the 

 end of the day, but it is not a jumbled heap 

 of blood-stained feathers. The weapon is 

 a camera, and the game is a truthful and 

 sometimes exasperating dry plate and so 

 he has written this book — a chronicle of 

 personal happenings ; of high hopes and 

 small adventures ; a living picture of the 

 busy, musical life that goes in the air, among 

 the treetops, and on the lakes and stream; 

 by which he spends his days. 



The Home Poultry Book. By E. I. Far- 

 rington. McBride, Nast & Company: 

 New York: 1913. Cloth, 8vo. Illus- 

 trated. 172 pages. Price, $1.00 net. 

 Many poultry books have been put 

 upon the market within the past few 

 years, but we doubt if any of them keep 

 closer to the line of instruction for the 

 novice than the Home Poultry Book. 

 Its aim is to tell those who have no 

 knowledge of poultry, and are desirous 

 of keeping a few hens, just how to begin. 

 It is not crowded with technicalities, but 

 goes straight to the point in a simple way, 

 and above all is so well illustrated, that 

 the amateur can judge at a glance which 

 type of hen best pleases his fancy, and 

 can have his poultry house constructed 

 on the lines of one of the many practica 

 buildings shown. 



THE INFLUENCE OF ATMOS- 

 PHERIC MOISTURE UPON 

 AUTOMOBILE MOTORS 



IT is a matter of common knowledge 

 among automobilists that in Summer the 

 motor works better, more smoothly and 

 more regularly in the earlv morning hours 

 and toward evening, when the air is moist. 

 The cause of this effect is somewhat ob- 

 scure. 



According to La Pratique Automobile , 

 a French engineer, M. Patrouilleau, sug- 

 gests a simple theory to account for the 

 fact. He points out that in Summer the 

 air is not only moister at night than toward 

 noon, but also cooler and therefore denser. 

 While the carbureter may work less effici- 

 ently in moist than in dry air, the influence 

 of the change in density more than com- 

 pensates for this. His influence is quite 

 markedly felt in ascending altitudes — there 

 is a loss of ten per cent in efficiency for 

 every three thousand feet or so. Further- 

 more, it must be borne in mind that the 

 vapor pressure (vaporizing tendency) of 

 gasoline rises very rapidly with the tem- 

 perature, increasing forty-fold for the tem- 

 perature range from the freezing to the 

 boiling point of water. Hence the influence 

 of temperature upon carburetion is very 

 marked. On a Summer's day the passage 

 of a cloud over the sun is sufficient to pro- 

 duce a distinct effect, and the difference be- 

 tween the action of the motor in the morn- 

 ing and at night is due, according to M. 

 Patrouilleau, to the same cause. 



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