XII 
THE GUIDE TO NATURE— ADVERTISEMENTS 
LITERARY 
The Nature of Animal Light. By E. New- 
ton Harvey, Ph. D. Philadelphia: J. B. 
Lippincott Company. 
The author has limited his attention to the 
physical characteristics of luminous animals 
and to the chemical processes underlying 
the production of light. From the popular 
point of view it is interesting to note his 
statement. 
“Apparently there is no rhyme or reason 
in the distribution of luminescence through- 
out the plant or animal kingdom. It is as if 
the various groups had been written on a 
blackboard and a handful of sand cast over 
the names. Where each grain of sand 
strikes, a luminous species appears.” 
He also cites some incidents so remark- 
able that if in a less scientific book from a 
less trustworthy author they might suggest 
the so-called nature faking. For example, 
he speaks of a glowing frog that had be- 
come luminous by eating fireflies. He says: 
“I remember once while collecting lumi- 
nous beetles in Cuba, I was astounded to 
find a frog which was luminous. Expecting 
this animal to be of great interest, I exam- 
ined it further only to find that the frog had 
just finished a hearty meal of fireflies, whose 
light was shining through the belly with con- 
s'derable intensity.” 
The reviewer will try to match him. He 
once had an article on fireflies and received 
the proof from the printer in the evening’s 
mail. He caught a large number of fireflies, 
put them in a bottle and read the proof 
by their light, making the statement in an 
addition to the proof. 
Next. If you can beat it. 
Joyful Wash Day! 
BY CHARLES D. ROMIG, AUDEXRIED, 
PENNSYLVANIA. 
The dread of wash day may yet become a 
pleasure when we consider the great variety 
of new devices on the market for doing that 
kind of work. Not every one can afford a 
washing machine but many persons have 
automobiles, and rough roads create a cer- 
tain variety of eccentric and erratic motions 
that would be useful in doing the family 
wash, provided you soak the clothes in a 
good, tight wash boiler or two, using good 
washing powder properly placed, and filling 
the boiler about three-fourths full of clothes 
and water. Put this aboard the automobile 
on any day in the week and start off. 
A drive of one hour should be ample but 
longer will do no harm. The farmer and 
his wife can drive to town together on wash 
day. The city man and wife can drive to 
the country, family included, leaving the 
washerwoman to help entertain callers wdiile 
the owners are out. 
When it comes to wringing, drying and 
ironing, just get mad and go for it. There 
will be a w r ay out of that also in time. The 
success of this plan depends on the boiler 
being slop-proof or tight and a right quan- 
tity of clothes, water, soap, etc.! ! 
What will the 
negative show? 
There’s density and definition; detail in 
high lights and shadows; correctness of 
perspective; color value — consider all 
these. For the negative can show only 
what the lens throws upon it. And any 
picture worth taking at all is worth tak- 
ing as w ? ell as it can be taken. In other 
w-ords, take it with one of the 
BAUSCH & LOMB 
PHOTOGRAPHIC LENSES 
In poor light — cloudy or rainy outdoors, 
on porches or indoors — good snapshots 
— better than many a time exposure — can 
be made easily through Bausch & Lomb 
Tessar Anastigmats (Ic, f:4.5 or lib 
f:6.3). And in bright sunlight they stop 
the fastest action blurlessly. 
Ask your dealer to put Tessar 
Anastigmat on your camera. 
Then you will see how pleasur- 
able photography can be. 
Bausch jomb Optical (o. 
NEW YORK WASHINGTON SAN FRANCISCO 
CHICAGO ROCHESTER. N. Y. London 
Leading American Makers of Photo- 
graphic Lenses, Microscopes, Projection 
Apparatus (Balopticons), Ophthalmic 
Lenses and Instruments, Photomicro- 
graphic Apparatus, Range Finders and 
Gun Sights for Army and Navy, Search- 
light Reflectors, Stereo-Prism Binoculars, 
Magnifiers and Other High Grade Optical 
Products. 
