522 
FOREST AND STREAM. 
[April 3, 1909. 
Camp Life ii\ the Woods 
HAMIlTOtV GlBSON = - — 
A Complete Manual of Wood Life 
Handy, complete, with full explanations and directions so written that 
they are readily understood. Camp Life in the Woods is an invaluable book 
for camper, hunter, fisherman, trapper, for every one who goes into the 
woods for sport or recreation. 
Covers all details of “roughing it,” camping, shelter building, cooking, 
wood craft, canoe building and handling, trapping and taxidermy. Good 
for every outdoor man. 
Full of “the tricks” that make for success in trapping, it is indispensable 
to every one, novice or old-timer, who plans a campaign against the fur-bear¬ 
ing animals the coming season. Cloth, fully illustrated. 
Postpaid, $1.00 
FOREST AND STREAM PUB. CO., 127 Franklin Sf., New York City. 
4 
The “Forest and Stream” Trap Score Book 
Meets the needs of gun clubs and shqoters in every particular. The 
150 sheets are heavily ruled—an advantage all scorers will appreciate, 
particularly when working in a dim light. The horizontal spaces are 
numbered from i to 30. Broad perpendicular lines divide these into 
groups of five, which aids the eye of the scorer greatly. Similar heavy 
lines divide the perpendicular spaces into groups of six; thus the 
squads are distinguishable at a glance. 
The paper manifolds easily, and carbon sheets are placed in the 
book for that purpose. 
It contains the American Shooting Association Rules for Live-Bird 
Shooting, for Double Live-Bird Shooting, for Inanimate Target Shoot¬ 
ing; Hurlingham Revised Live-Bird Rules for single and double rises, 
and the Rose System of dividing purses. Price, $1.00. 
FOREST AND STREAM PUBLISHING CO., NEW YORK CITY 
A Few Left 
MALARIA, MOSQUITOES, AND 
MILLIONS. 
One of the most instructive instances of the 
truth of the adage that prevention is better than 
cure is afforded by the attempts made in the past 
to combat that scourge of tropical countries 
known as malarial fever, says the London Field. 
For many years no trouble was spared to find 
a prophylactic for it, and to discover the most 
effective treatment for those who had con¬ 
tracted the disease. Little success, however, at¬ 
tended these efforts, and it was not until the 
cause came to be scientifically investigated that 
prevention was found to be as easy as cure was 
difficult. Wherever malarial fever was preva¬ 
lent mosquitoes abounded, and it was only by 
taking the most inconvenient precautions that 
the attacks of these blood-thirsty little insects 
could be guarded against. The discovery of an 
intimate connection between the spread of fever 
and the bites of mosquitoes constituted the 
great advance in the campaign against the 
dreaded plague, and attention is now directed 
entirely to the destruction of the mosquitoes 
as a means to an end. Some time ago we men¬ 
tioned the success that had attended the efforts 
of the Suez Canal Company in stamping out 
the disease at Port Said and Ismailia, and sim¬ 
ilar results have been achieved in many other 
places. 
There are many species of mosquitoes, or bit¬ 
ing gnats, those responsible for the spread of 
malarial fever being the Anopheles. In all cases 
reproduction takes place in still or stagnant 
water, on or about the surface of which the 
eggs are laid, and in which the larval stage is 
passed, and is followed by pupation. When the 
development of the pupa is complete the per¬ 
fect insect emerges. On the discovery that the 
mosquito was the instrument in disseminating 
fever, conveying the infection in the course of 
its attacks first upon malarial sufferers and then 
upon the healthy, steps were at once taken to 
deprive it of the facilities for reproduction 
which commonly abounded. With this object 
every pool of stagnant water was drained, or, 
if this were impossible, a small quantity of pe¬ 
troleum was thrown upon the water. This 
spreads over the entire surface in the form of a 
thin film, and its presence effectually destroys 
the larvae by suffocation, as they are. unable to 
obtain air when they come to the surface to 
breathe. The adoption of these simple meas¬ 
ures has already had remarkable results in 
checking the ravages of malarial fever in many 
tropical places. 
These, however, are not the only weapons 
which humanity has discovered for defending 
itself against a foe which is formidable enough. 
Millions (Girardinus poeciloides). 
Adult female, twice natural size. 
BARGAINS IN BOOKS 
Some weeks ago we offered a list of books at bargain prices. Some were abso¬ 
lute]}" new, samples, review copies, odds and ends of editions. More were shop 
worn, soiled, or subject to slight imperfections. All were good books, worth much 
more than the prices asked. 
IMany of our readers took advantage of this opportunity, but we have a few of 
these books left. There is still a splendid opportunity for judicious book buyers. 
If the one you want is here it is certainly a bargain. Write to-day for complete list. 
FOREST AND STREAM PUBLISHING CO. 
127 Franklin Street ----- New York City 
in all conscience, even when disease is left out 
of the question. Excellent results have some¬ 
times been obtained by playing off one animal 
against another, and the quest for a natural 
enemy of the deadly mosquito has recently 
caused attention to be drawn to the existence 
of a little fish, which promises to become a 
powerful auxiliary in the abatement of the 
mosquito plague. These fish, the scientific 
name of which is Girardinns poeciloides, are com¬ 
monly known as millions, presumably on ac¬ 
count of the vast numbers in which they occur. 
They are exceedingly small, the adult female be¬ 
ing about lyh. inches only in length, while the 
male is much smaller. They are viviparous and 
very prolific, and, as they usually frequent very 
shallow water, are able to keep out of the way 
of larger predatory fish. They are very hardy, 
and do well in captivity, thriving and multiply¬ 
ing in ponds, fountains, reservoirs, and aquaria 
in which plants are kept. Millions are natives 
of Barbados, and some three years ago C. K. 
Gibbons suggested that the immunity from 
